Mods-Supercharged-Gas Mileage

[MarauderTJA]

Just got back last night from Dennis Reinharts where he and his mechanic installed his ceramic coated/ported Cobra Manifolds and exhaust system, a PI Stallion 3000 stall convertor and an Adeco rear sway bar. In by 8 am and out on the road by 1:30 PM. Great Job Dennis. I was really surprised at the difference of the diameter of the thin stock manifolds over the fat Cobra's when side-by-side. Ford should be ashamed of itself to put those on our cars. Talking about choking the exhaust:( And the Super 40's sound 10X better. Authoritive around town and nice and quiet on the highway at 75-80 MPH. No drone whatsoever. A great choice of mufflers for our cars. I love them.

Since getting the car supercharged this past March my mileage went waaaaaayy south. With 4:10's, JLT kit, stock exhaust, chip I was getting 18 City / 22 Highway. After supercharging I dropped to 14 City / 16.6 Highway. Now I realize that I have been part of the gas mileage problem since the supercharger install. Needless to say I have been getting on it much more (just ordered my second set of tires today) but also realize how nasty those carbon deposits can be inside the motor (that is what I tell my wife anyway).

Whereas I use my Marauder for some lengthy highway trips (2-3K) at least once or twice a year, the low highway mileage was somewhat concerning. I knew exhaust would seriously help. As it turns out substanially... On the trip up DR's, a six hour drive, both highway and some open back roads I really baby'd the car and got a combined 17.6 MPG. After the install of the exhaust and convertor the return trip was 19.7 MPG! Same route on the return. And I was having fun with the Stallion and enjoying the exhilerating sound of the exhaust at lights :coolman: snapping necks with some of the :eek: country folks in north central Florida:depress:

I was wondering how you other supercharged guys are doing with MPG on the highway with your cars based on the mods you have installed.

Tom, Cape Coral, Florida

[stevengerard]

I am at 9 - 11 mpg, I need to see if I can up that, though part of it is that I have been driving around with OD off.

[sailsmen]

Hwy 19 and city 15 but that is with no WOT in city. Well almost no WOT in city. :)

[MarauderMark]

I am at 9 - 11 mpg, I need to see if I can up that, though part of it is that I have been driving around with OD off.


I agree with Steve at first but it went downhill from there that i just gave up and allways bring extra money... :D

[MarauderTJA]

I am at 9 - 11 mpg, I need to see if I can up that, though part of it is that I have been driving around with OD off.Man. I don't feel so bad. I know we don't have these cars for high gas mileage, otherwise we would buy hybrids. But my 14/16 does not seem too bad next to 9/11. Plus getting on it doesn't help either. But that is the fun in having the car supercharged. How about you Trilogy guys...

[Tallboy]

How about you Trilogy guys...
I have never kept track of fuel mileage in my Marauder. Ever. As long as the check engine light doesn't come on and I don't have black, sooty tailpipes, she's entitled to all the Amoco Ultimate she can wolf down.

[Cobra25]

Before my final tune at DiabloSport I was getting around 18.6 mpg. That was doing 80-85 mph with the A/C on. I know it has went up some but I haven't taken it on a trip yet to get any new numbers.

[MarauderTJA]

Before my final tune at DiabloSport I was getting around 18.6 mpg. That was doing 80-85 mph with the A/C on. I know it has went up some but I haven't taken it on a trip yet to get any new numbers.
That is acceptable...I had the AC one about half of the trip up and back to Jacksonville from Cape Coral. I am a fresh air freek anyway. Previously I loss about 1-2 MPG with the AC.. Not bad overall.

[HwyCruiser]

I'll let you know in a couple days. :D

Happy to hear Dennis took good care of you. :up:

[bigslim]

First week I had my Trilogy I spent $70 on gas. It seems I was always into the boost. I guess that is the price of having fun. You know the saying " Difference between men and boys are the price of their toys".

[WildMarauder]

I think this thread would lend itself to using the "poll" format. We could ask MM owners who have superchargers, high-stall converters, and 4.10/4.30 gears to respond by picking one of a number of ranges for combined and/or highway driving. Those of us significantly below average may have mechanical or tuning issues.


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I was wondering how you other supercharged guys are doing with MPG on the highway with your cars based on the mods you have installed.

Tom, Cape Coral, Florida

[BillyGman]

Since you've asked about us Trilogy customers' gas mileage, I'll weigh in here.....

I have taken my gas milage a number of times since I installed the Trilogy supercharger on my Marauder. Keep in mind that I have 4.56 gears, and I know for a fact that when I went from the 4.10's to the 4.56's it dropped the gas mileage by 2 MPG. So now I'm getting 16.5-17 MPG on the highway, and 12.5-13 MPG around town with 93 octane pump gas (which is what I always use both on and off the track).

[MarauderMike]

I made a recent trip up north and back, very little boost time, running 70 mpg I got 22.9 mpg on the highway. I haven't checked my in town mileage on this car at all. I'll be heading on a longer trip at the end of the month, should prove out the highway mileage on the long run.

[BillyGman]

I made a recent trip up north and back, very little boost time, running 70 mpg I got 22.9 mpg on the highway. .That's pretty good Mike. You must still have the stock 3.55 gears in the rear.

[MarauderMike]

Yeppers, all stock except for the Trilogy and the OEM style replacement K&N air filter. Problem with around town driving is keeping the right foot off of the floorboard. :D The louder the whine, the more the fuel injectors dine. Oh well if I wanted fuel mileage I'd be driving a Yugo(Not on your life).

[MarauderTJA]

Since you've asked about us Trilogy customers' gas mileage, I'll weigh in here.....

I have taken my gas milage a number of times since I installed the Trilogy supercharger on my Marauder. Keep in mind that I have 4.56 gears, and I know for a fact that when I went from the 4.10's to the 4.56's it dropped the gas mileage by 2 MPG. So now I'm getting 16.5-17 MPG on the highway, and 12.5-13 MPG around town with 93 octane pump gas (which is what I always use both on and off the track).
That would be what I think my car would probably get with 4.56 gears. I am getting 2 more MPG than you with the 4.10's. Interesting that your mileage with the Trilogy is basically the same with the Procharger, gear ratio respective. I drive my car quite often spirited as I am sure that you do.

[BillyGman]

That would be what I think my car would probably get with 4.56 gears. I am getting 2 more MPG than you with the 4.10's. Interesting that your mileage with the Trilogy is basically the same with the Procharger, gear ratio respective. I drive my car quite often spirited as I am sure that you do.Yep.....it sounds to me like there isn't much(if any) difference at all in gas mileage between the two different S/Cer set-ups. I get into the boost atleast a little bit every single day that I drive the car, and have been doing so for the last 17,000 miles. The car doesn't see the full 9.5 PSI of boost pressure every day, but definately sees 2 or 3 PSI every day, and full boost atleast once per week. It depends on how often I have an open road with very light traffic, because as I'm sure that you know, you just cannot open up the throttle all the way on a supercharged Marauder just anywhere or any time. you need plenty of room!

[MarauderTJA]

Yep.....it sounds to me like there isn't much(if any) difference at all in gas mileage between the two different S/Cer set-ups. I get into the boost atleast a little bit every single day that I drive the car, and have been doing so for the last 17,000 miles. The car doesn't see the full 9.5 PSI of boost pressure every day, but definately sees 2 or 3 PSI every day, and full boost atleast once per week. It depends on how often I have an open road with very light traffic, because as I'm sure that you know, you just cannot open up the throttle all the way on a supercharged Marauder just anywhere or any time.
you need plenty of room!I do about the same daily as well in regards to getting on the boost. My next mod will be big brakes. I am going with Baer Claw brakes, GT+ Calibers slotted, cross drilled zinc washed 14" rotors w/ 12" rotors in the rear. I have 13" Baer brakes at all four corners on my supercharged Mustang and it can really stop. Just have to put aside some more $$$$$. I just rolled over to 18K and I bought the car last July 3rd.

[BillyGman]

Yeah, the brake upgrade is equally as impressive. I still have the stock brakes on my Marauder, and they work okay, but I drove John's car (aka "Jet") after him and I raced eachother twice at the track, and his brakes worked excellent, and stopped his car so much better than mine does since he has the brake upgrade. It isn't cheap, but it works very well.

[stevengerard]

Yeah, the brake upgrade is equally as impressive. I still have the stock brakes on my Marauder, and they work okay, but I drove John's car (aka "Jet") after him and I raced eachother twice at the track, and his brakes worked excellent, and stopped his car so much better than mine does since he has the brake upgrade. It isn't cheap, but it works very well.

I have th KVR's just waiting to be put on. Will it help my MPG :rolleyes:

[SergntMac]

17/22...And I think the guy with best mileage should have to post his gas slip, or we beat him up. What do you say guys...

[MM03MOK]

17/22...And I think the guy with best mileage should have to post his gas slip, or we beat him up. What do you say guys...I'm glad you didn't say her! :rofl:

I'll be tracking my mileage to Michigan, Cleveland and home this week.

[MarauderTJA]

I have th KVR's just waiting to be put on. Will it help my MPG :rolleyes:Yeah. The drag factor, increased surface friction, better looking calibers along with a better wow factor is bound to increase your MPG:cool: .

And Bunny, we all know that the girls get better MPG than us guys, Girls can do more things at the same time driving and talking on a cell phone than we could ever think of accomplishing:P :P :P :P :P :P .

[Smokie]

17/22...And I think the guy with best mileage should have to post his gas slip, or we beat him up. What do you say guys...Now, that's funny.....:lol:

[John F. Russo]

I got 17.5 mpg at 80 mpg (one full tank of gas) during the first 1,000 miles of owning my Kenny Brown conversion (4.10 gears) from my first day of driving my car. (BTW, Is it gear or gears?)

The car was driven a steady speed of 80 mpg on the Pennsylvania turnpike.
(I was driving from Kenny Brown's facility in Indiana to Boston.)

I have checked my mileage since then and it is still within 0.5 mpg of the 17.5 mpg even though the highway speed varies more.

[MarauderTJA]

I got 17.5 mpg at 80 mpg (one full tank of gas) during the first 1,000 miles of owning my Kenny Brown conversion (4.10 gears) from my first day of driving my car. (BTW, Is it gear or gears?)

The car was driven a steady speed of 80 mpg on the Pennsylvania turnpike.
(I was driving from Kenny Brown's facility in Indiana to Boston.)

I have checked my mileage since then and it is still within 0.5 mpg of the 17.5 mpg even though the highway speed varies more.
I checked my around town/city, nailing it (3-5 lbs of boost) every-so-often mileage today after a fill up and I only got 14 MPG. Figure. Hey John, I grew up in Billerica, moved to the Cape and spent 20 years there. Heading to the Cape this summer to visit my mother. Maybe we can hook up.:beer:

Tom, Cape Coral, Florida

[HwyCruiser]

Results from KC - Cedar Falls - KC round trip (first trip to stretch my ProCharger'ed MM's legs):

714 miles between first fill-up in KC and last took 36.707 gallons of 92/93 octane. Equals 19.45 mpg mixed / mostly highway.

My best run was from DesMoines back to Liberty, MO where I filled up last and did 182 miles on 8.663 gallons. Equals 21 mpg on the rolling hills of southern Iowa / Northern Missouri. Climate control in "automatic" all the way during that stretch (80's - 90's outside).

First half tank of 92/100 mix yielded 14.1 mpg all city miles with some fairly rambunctious driving. ;)

Your milage may vary < insert rest of disclaimer here >.

EDIT: Powertrain mods include 4.10 gears, PI 3000 rpm Stalion torque converter, DR cobra exhaust w/ Magnaflow mufflers, FIT ProCharger kit (P1SC w/ 370 pulley @ 8-9 psi of boost, 2 core air-to-air intercooler)

[MarauderTJA]

Results from KC - Cedar Falls - KC round trip (first trip to stretch my ProCharger'ed MM's legs):

714 miles between first fill-up in KC and last took 36.707 gallons of 92/93 octane. Equals 19.45 mpg mixed / mostly highway.

My best run was from DesMoines back to Liberty, MO where I filled up last and did 182 miles on 8.663 gallons. Equals 21 mpg on the rolling hills of southern Iowa / Northern Missouri. Climate control in "automatic" all the way during that stretch (80's - 90's outside).

First half tank of 92/100 mix yielded 14.1 mpg all city miles with some fairly rambunctious driving. ;)

Your milage may vary < insert rest of disclaimer here >.

Excellent high of 21 mpg. My high was 19.7, your city was the same as mine but I didn't use any 100 octane mix. Pretty good overall for a blown car the size and weight of the Marauder.

[FiveO]

Trilogy #48
4.10's
Full Kooks exhaust
2400 stall PI Torque Converter

= 15mpg city, 20-21 highway.

4600 pounds with driver alone and 1/4 tank of gas.

[Bradley G]

Funny stuff Mac! :lol:

Looks like my near 25 mpg(legit)N/A is gonna take a big hit if and when I get a serious power adder.:hijack: Sorry
Bradley G

[SergntMac]

25 MPG! PROVE IT! Post your gas slip!

Just kidding, Bradley, but I lost MPG when I moved up to a power adder, you should expect to lose MPG as well.

My first Marauder was N/A, and after adding all the mods I could add at the time, I achieved a personal best of 24.4 MPG on road trips, maintaining an average cruise speed of 70-75 MPH. The best I've seen with the Kenny Brown #1x was 22 MPG, again, maintaing a cruise speed of 70-75 MPH. However, this last road trip to Barry's back yard this past weekend, well, (ummm, er, ahem) MPG "dipped a bit" to an average of 17 MPG, most likely due to our average cruise speed of 80-85 MPH. Zack's the best point man I've ever followed, but his taste for low altitude "fly-bys" comes with a price.

IMHO, how you drive has a lot more to do with MPG than whether you're supercharged, or, not. Logically, adding mods to a Marauder should lead to improved MPG, but often does not simply because we tend to drive differently once more mods are present and functioning correctly. Once you step into power adder territory, it doesn't change. The better you run, the more you will run.

[MarauderTJA]

Funny stuff Mac! :lol:

Looks like my near 25 mpg(legit)N/A is gonna take a big hit if and when I get a serious power adder.:hijack: Sorry
Bradley GBrad, outstanding mileage for a n/a car. The most I got with my car before supercharging was 22 mpg w/o AC. But power has it's costs. MIlegage is one of them. All us with S/C Marauders will sacrifice the MPG for that incredible surge of power. It is a high that forgives the gas mileage every time....Tallboy (Chuck) said it the way it is. " I'll give my S/C Marauder all the Amoco Ultimate it can Gulp." So true.......

[MARAUDER S/C #5]

80 mpg
:eek: .......WOW

[Bradley G]

LOL I did keep the gas reciept but I tampered the trip set:rolleyes: .

I got 250 miles on 10.46 gal. on the way back from Cedar falls.I did the speed limit the whole way:( .Except for a couple times, when I could'nt help myself:nono:
Sidenote:Actually, yesterday, My guardian angel was watching my Azz, After several people turned left in front of me on my green arrow,I got lost in my head and stomped the go-fast pedal for a bit ,only to look in my rear view to see a LEO who proceeded to turn after I did and followed me for a LOng TIme!:sweat:(to make matters worse I did not have my bilfold on me):stupid: I thought I was in the clear, since I past several other LEO's moments before traveling the opposite way.I guess I sould keep that in mind for next time(sometimes they travel in #'s) I have a bout with temporary insanity.
OH, who am I kidding:P
Bradley G

25 MPG! PROVE IT! Post your gas slip!

Just kidding, Bradley, but I lost MPG when I moved up to a power adder, you should expect to lose MPG as well.

My first Marauder was N/A, and after adding all the mods I could add at the time, I achieved a personal best of 24.4 MPG on road trips, maintaining an average cruise speed of 70-75 MPH. The best I've seen with the Kenny Brown #1x was 22 MPG, again, maintaing a cruise speed of 70-75 MPH. However, this last road trip to Barry's back yard this past weekend, well, (ummm, er, ahem) MPG "dipped a bit" to an average of 17 MPG, most likely due to our average cruise speed of 80-85 MPH. Zack's the best point man I've ever followed, but his taste for low altitude "fly-bys" comes with a price.

IMHO, how you drive has a lot more to do with MPG than whether you're supercharged, or, not. Logically, adding mods to a Marauder should lead to improved MPG, but often does not simply because we tend to drive differently once more mods are present and functioning correctly. Once you step into power adder territory, it doesn't change. The better you run, the more you will run.