Originally Posted by rriggs
While technically 88 should be ok that just seems really low to me especially for a new car.
87 is the regular fuel in the United States and that is what all normal cars here are tuned
to run on. The manual here states that regular 87 is recommended and nothing else, it says in the book there is no benefit to using higher octane fuel (and they are correct).
Is it possible to squeeze a tiny bit more power out of higher octane fuel? Sure, in theory
, but not just by dumping the high octane fuel in. With the amount of computer control that exists over the engine, it really just comes down to tune
. You should run what the manual says the car was programmed for, and it will usually be programmed for the typical fuel in your region of the world. A hundredth of a second of adjustment in ignition timing is probably all it boils down to. Running high octane fuel in something programmed for 87 won't get any benefit, because it is still doing the timing for 87 fuel while your extra money goes out the tailpipe.
Ever notice that in general marketing the 2.4 Multiair II Tigershark is advertised as producing 184 HP, but in the United States on the Jeep website it is advertised as 180 HP for the Compass? This, in my mind, is undoubtedly a result of the 87 octane tune for our typical fuel here. A tiny bit less power to run the regular affordable commonplace fuel. I don't really mind, it is what it is.