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Unless your running a tuner set up for high octane, that's just a waste.
the computer compensates so you have to run a few tanks to get the proper tune. yes the truck self tunes. but I do have the diablosport and love it.
The fuel price is built in the sticker / msrp / invoice / whatever you pay for it. The dealer is NOT doing any favors.
Mine was filled up by the dealership and they threw in my first oil change in for free also. Checked on paperwork and no fuel charge on mine. As far as i am concerned it is cheap advertising if they treat you right and you bring them business.
so the dealership is charging you extra to fill your tank on a new $50K truck? classless
Wilson's correct, it's in the manual. The truck makes one horsepower on 87 octane, and another rating on 91. Same with the 5.0 mustangs, and probably every engine they have now. The computer can detect detonation, and adjust the tune to run on an optimal setup for that fuel. The power ratings published are for 91. I find it funny guys will spend $400 on an intake to gain 10 hp, when they can spend a few bucks more a tank and gain 10 hp and run 91 lol.
It is a waste to run a higher octane than the computer can compensate for. I ran 93 for a few tanks, then I actually switched to 91 and my mileage went up a tad, and no difference in power. And it makes sense, the computer an only compensate for up to 91, but beyond that, it's like the older vehicles running a higher octane than calibrated is a waste.
So 87-91 all fair game and the truck will compensate accordingly.