93 octane for 2012 GT
#3
As a matter of fact, 91+ Octane is the recommended fuel for this vehicle. The car will only make 412/390 on premium gas. If you use 87/89 you actually will be putting out 402/377.
This info can be found on the official specifications on the Ford website, here.
This info can be found on the official specifications on the Ford website, here.
#4
I don't know if it was due the the new car break in period or what, but I was using 87 octane I had experienced horrible gas mileage until I switched to 91 and above. I was getting around 13 avg in town. I'm up closer to around 16 in town with 91 octane, which is till horrible but closer to the window sticker EPA 17-26
#7
6th Gear Member
The 5.0 picks up some minor power with higher octane on the stock tune. But you'd see larger gains with a custom 87 octane tune compared to the stock tune on 93.
#9
^^What he said. The stock tune tables do have different settings according to octane count, 91octane being the max possible tune advances in the tables.
And when you put in a lower octane fuel, the engine's PCM switches to more retarded tables (not retarded as in stupid, but as in retarded spark, cam phasing, etc, LOL)
^^ Again, what he said. A custom tune can unlock more power that the stock tune cannot because it is hobbled for many reasons, primarily a very generous engineer's safety factor, for fuel economy purposes, driveability issues, etc.
And when you put in a lower octane fuel, the engine's PCM switches to more retarded tables (not retarded as in stupid, but as in retarded spark, cam phasing, etc, LOL)
But you'd see larger gains with a custom 87 octane tune compared to the stock tune on 93.