My thoughts so far:
My 73 yo co-driver (and her service dog) have been the primary 'drivers' since we picked up the car yesterday about 179 miles away. 868 miles each way from my house to where we picked up the car at the owner's business.
No complaints about my driving on the way up but she complained bitterly about my driving when coming back to the same location where we spent the previous night. She wanted to drive the Mustang but the power seat is inoperable (blown fuse?) so she's in the Marauder. I drove the Marauder briefly last night running local errands for food and adult beverages to bring back to the hotel.
Had car serviced before we departed the area where the car had spent its entire life. No record of coolant having ever been changed, diff and trans fluids (and axle seal) changed when previous owner took possession 12 years ago. Car was still under warranty so I don't know why he paid for the axle service - didn't ask (have receipt). Oil changes every year. New battery last year. 'New' tires installed shortly after purchasing car 12 years ago - still look new. First owner put on nearly 15k per year during his ownership. 2nd owner averaged less than 1k miles per year. I'm averaging about 3k per year on my vehicles at present.
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The car:
Appears to be brand new - super clean. Has the trunk organizer, front license plate bracket still in the trunk (screws in the cup holder), heated seats, trunk release in the driver's door, door lock combination keypads, shorty roof console, cd changer in trunk - seems to have every option except the moonroof (getting one installed shortly). Previous owner donated a like new car cover.
Marauder is substantially heavier than my '05 GT and feels positively lethargic when compared. To be fair, the 'stang has the stock 3:31 rear diff gears, K&N CAI and Superchips 93 octane tune. Both truly excellent cars IMO for their intended purposes.
E0 93 octane is nearly completely unavailable on my routing for this trip. Running through the mountains with the cc set at 75 mph at every opportunity (with a/c on) the Mustang's trip computer stated we averaged as much as 27.5 mpg.
Switching to E10 later in the trip (on flatter ground) the average dropped down to about 22.5 mpg at the same speeds (per trip computer) and never went much above 23 mpg on rare occasions. All of my vehicles definitely run better and get noticeably better fuel economy on E0. One station not far away from my house sells E0 93 octane fortunately.
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Not much else to add other than I'm thrilled with my new acquisition and my 'new'(?) Marauder leather jacket was delivered yesterday - will see it tomorrow when I arrive home. Marauder will definitely get 3:73 or 4:10 gears, CAI and tune at the first opportunity. Bumping the 'stang up to 3:55 gears shortly.