terrible gas mileage after Xcal2

[playbackreks]

Hey guys...

I got my Xcal2 in almost two weeks ago, and I love the difference in power and shifting, but my gas mileage has dropped almost 33%.

I always fill up at 1/4 of a tank left. Before the tune, I would go 280-300 miles (roughly 100 miles per quarter tank). With the tune, I made it to 1/2 tank at 150 miles, and filled up again, then I made it to 1/4 tank with 200 miles. I then returned back to stock, and got about 50 more miles out of it before fillup.

I'm going to test my mileage on this tank with the stock tune and see if it climbs back up. I'm not sure why it was such a dramatic decrease, because I thought I would see a slight increase in mpg.

Any suggestions? Do I need to disconnect the battery for 15 minutes after installing the tune?

Any help is appreciated... thanks in advance

-Daniel

[Dennis Reinhart]

Hey guys...

I got my Xcal2 in almost two weeks ago, and I love the difference in power and shifting, but my gas mileage has dropped almost 33%.

I always fill up at 1/4 of a tank left. Before the tune, I would go 280-300 miles (roughly 100 miles per quarter tank). With the tune, I made it to 1/2 tank at 150 miles, and filled up again, then I made it to 1/4 tank with 200 miles. I then returned back to stock, and got about 50 more miles out of it before fillup.

I'm going to test my mileage on this tank with the stock tune and see if it climbs back up. I'm not sure why it was such a dramatic decrease, because I thought I would see a slight increase in mpg.

Any suggestions? Do I need to disconnect the battery for 15 minutes after installing the tune?

Any help is appreciated... thanks in advance

-Daniel

Daniel there is no reason for this, possibly a corupt file, call me Monday I will look at the file and send another one free of charge, I am on the road headed for the SSM picnic

[playbackreks]

Daniel there is no reason for this, possibly a corupt file, if you bought this from me call me Monday I will look at the file and send another one free of charge,

Dennis,

I did buy it from you. I'll give you a call Monday...

Thanks for the quick response.

[Blackened300a]

Hey guys...

I got my Xcal2 in almost two weeks ago, and I love the difference in power and shifting, but my gas mileage has dropped almost 33%.


Ever think that you are now heavy into the throttle testing out the new found performance and thats whats killing your mileage?

[fastblackmerc]

Ever think that you are now heavy into the throttle testing out the new found performance and thats whats killing your mileage?

BINGO!!! :banana2: :banana2:

[Dennis Reinhart]

It could be that, or it could be bad gas, the files I use are constantly revised, and they are tried and proven in more than one car so if it was a mistake in the file more than one person would have this issue, regardless we'll figure this out.

[KillJoy]

:up:

Keep you foot OUT of the gas and see where your gas milage goes :D

KillJoy

PS - Dennis, why am I only getting 13MPG now??? :D

[MM2004]

:up:

Keep you foot OUT of the gas and see where your gas milage goes :D

KillJoy

PS - Dennis, why am I only getting 13MPG now??? :D

Prolly because of WOT burnouts in car wash parking lots??

:nono:

Mike.

[KillJoy]

Prolly because of WOT burnouts in car wash parking lots??

:nono:

Mike.

THAT was just one tank!!!! What about the rest of them??? :D

Oh yeah.....it was the Mustangs.

And Vettes...

Oh yeah....and that Porsche :D Them Caymen's LOOK quick :rolleyes:

:beer:

KillJoy

[chader]

you should work out the actual milage not just miles/parts of the guage??

[Marauderjack]

Miami traffic + BIG foot = POOR fuel mileage!!:D

My fuel mileage actually went up abut 15% with SCT tune but most of my driving is Highway!!:cool:

Dennis will work it out for ya!!;)

Marauderjack:burnout:

[GreekGod]

...you must compute fuel mileage properly. Read your owners manual. Your technique is bogus!

[jcjf23]

I didn't see a 33% drop, but I did get a 7 % drop. It went from about 19.2 to 17.8. These numbers are consistent tank after tank. This is on the same driving circuit, same winter gas, same winter tires, same driving habits. The only difference was the change from the stock tune to Dennis' 355 tune. I think this may be fairly typical of what to expect.

[playbackreks]

There have been two fillups since the initial tune. I went through the rest of the first tank very fast testing it out :)

I honestly haven't had a heavy foot since the first fillup.

I know my estimates don't give me the exact mpg, but it's not like my method of measuring it doesn't show a huge difference.

[jcjf23]

My comment "I think this may be fairly typical of what to expect." was targeted at the 7% change, not your 33% change.

[Glenn]

The only way to accurately measure MPG is to measure exact miles between complete fill-ups, i.e. gas up to the neck. Very inaccurate to do using the fuel gauge. In addition, mix of type of driving significantly affects mileage.

Glenn

[playbackreks]

90% of my driving is highway. 26 miles each way to work, 52 miles a day.

[Marauderman]

....with my new tune from Dennis, when I gas up my numbers go up and up,...on the dash.........isn't that what we're talking about..........:lol:

[playbackreks]

Dennis,

I just wanted to let you know that I called but no one answered. I didn't leave a message. I'm going to go ahead and reflash with the 3.55 tune and fill her up tonight. After this tank is gone, I'll post my mpg results.

Thanks,
Daniel

[KillJoy]

make sure you drive it the SAME WAY, and refill at the SAME PUMP and refill to the SAME SPOT!

KillJoy

[MercModifier]

Does anyone really care about mpg?
I drive mine like its stolen.

[GreekGod]

deleted deleted

[playbackreks]

This will total 2 1/2 tanks.... how many tanks do I need not to be

[GreekGod]

2000 miles, not really tanks.

[MENINBLK]

Performance comes at a price.

One price was the Xcal2.
The second Price was the additional Fuel usage for the additional performance.
The third price will be a Stage 1, Stage 2, Stage 3, etc. setup...

[Dennis Reinhart]

This to me is not bogus so please lets keep this on track, he feels he has a issue I am working with him lets wait and see what the MPG is now

[GreekGod]

...an improved tune should make an MM run more efficiently. Mileage should stay the same, or get better.

[Dennis Reinhart]

...an improved tune should make an MM run more efficiently. Mileage should stay the same, or get better.


He feels he has a issue I am working with him lets wait and see what the MPG is now.<!-- / message --><!-- sig -->

[GreekGod]

Page 198 of 2003 MM owners manual:

..." Fuel expense, frequency of fill-ups, or fuel gauge readings are NOT accurate as a measure of fuel economy."

page 199 and 200 continue with instructions for calculating proper estimates. Excerpts:

..."Use the same side of the same pump and have the vehicle facing the same direction each time you fill up."...

..."3. After at least three to five fill-ups"...

..."Keep a record for at least one month"...

A single tank fill-up can give an estimate for one tank only.

[GEMs Marauder]

I installed a reinhart 355 xcal tune on my marauder 2 weeks ago, added plus 2 degrees on 0-2000 and plus one on 2-4000, my MM is faster, more low end torque and much better on gas. Thanks to Dennis and my brother.

[Marauder386]

Watching this thread...even though I dont really care about MY gas mileage...tire wear is my problem. The rear tires just dont seem to last very long...


:cool:

[StevenJ]

Well after a few tanks with Dennis's tune, my gas millage has actually gone up to 18.6 on the last vrs. 17.6 with my last tune. I am worried though, the car seems to run a little too lean. I hear rattling when the motor is cold. That is something that I can adjust since Dennis sends his tunes unlocked, thank you Dennis btw!

[playbackreks]

Well guys, everything is fixed now. I originally tuned my car with the 3.55 tune. I observed my mileage after starting this thread and noticed that my normal ride to work which is 26 miles, was coming out to 24 miles. I notified Dennis and he told me I had the 4.10 tune.

He sent me the 3.55 tune, I installed it, and my mileage went higher than it should, with my work ride clocking in at 28-29 miles.

Being that my car is used, and I already had the res delete tips from the previous owner, I thought that I may also have 3.73 gears. So I asked Dennis to send me a tune programmed for 3.73s, and that brought me back to 26 miles each way.

I'll find out my mpg when this tank is gone... who the hell would put 3.73s in their marauder?

[Dennis Reinhart]

To clarify the post, this 04 was bought used, and the owner never knew the car had 3:73 installed and its probably the only second Marauder I have heard having them installed, so really the issue was not gas mileage but the odometer being off. So I am glad this has been resolved.

[magindat]

who the hell would put 3.73s in their marauder?

Juno. And he's got a TURBO, too! Who the he!! would put a turbo in a MARAUDER?!

:shake:

[Todd]

Juno. And he's got a TURBO, too! Who the he!! would put a turbo in a MARAUDER?!

:shake:


I will be going back to 3.73's or the stock 3.55's soon..... I can see why someone would go back. Depending on how much power the car makes...

[magindat]

I will be going back to 3.73's or the stock 3.55's soon..... I can see why someone would go back. Depending on how much power the car makes...

:D I was HOPING that would draw a reaction from you! :lol:

[playbackreks]

I'm not knocking 3.73s... It's a free upgrade for me... but 4.10s seem like the standard. Even Dennis said he's never tuned a Marauder for 3.73s.

[jawz101]

Marauder Project Manager Steve Babcock had even commented that the MM should have come w/ 4.10s... so I've heard

[Todd]

:D I was HOPING that would draw a reaction from you! :lol:




You know me better than I thought!!! ;)

[Joe Walsh]

... who the hell would put 3.73s in their marauder?

I'm seriously thinking about putting in 3.73s or maybe even get weirder and install a set of Motive 3.90s.

The more torque your Marauder makes, the less gear you need.
I drive my Marauder on the highway most often, and I love the 1900 rpms she spins at 65 mph with the 3.55s.

[SC Cheesehead]

Well after a few tanks with Dennis's tune, my gas millage has actually gone up to 18.6 on the last vrs. 17.6 with my last tune. I am worried though, the car seems to run a little too lean. I hear rattling when the motor is cold. That is something that I can adjust since Dennis sends his tunes unlocked, thank you Dennis btw!


Mileage on mine is about the same, if not better. Took a trip from GVL to Wilmington, NC last weekend, 640+ miles round-trip, averaged 20.7 doing 70-75 mph. Best I got with the 3:55's and stock tune was 21.5, so NBD in my opinion.

SCCH

[Vortech347]

who the hell would put 3.73s in their marauder?

Yea what kind of retard would do that?!?! :argue:

[playbackreks]

I'm sorry... :)


Yea what kind of retard would do that?!?! :argue:

[Merc-O-matic]

Yea what kind of retard would do that?!?! :argue:


Please let's not use the word "retard"....my only daughter is severly
retarted and I find the word offensive when seeing that word used in a public form.
Maybe we should say....all Mormon's are "retarted" could be!
Thanks for your understanding.:mad2:

[Vortech347]

Is Jackass better?

[RF Overlord]

Yea what kind of retard would do that?!?!


Please let's not use the word "retard"....my only daughter is severly
retarted and I find the word offensive when seeing that word used in a public form.

Thanks for your understanding.


Is Jackass better?Seems to me the polite thing to say would have been "I'm sorry", rather than making another smartass remark.

[playbackreks]

Well anyways... I'm averaging 18-19mpg highway/city. I'm happy with that.

Thanks Dennis