Thread: 91 octane benefits in N/A 3800?

i have the supercharger. i bought the car about 2 months ago from a girl who used 87. it ran like a champ. i put 93 in it (the two stations i can find anything higher than 91) and runs the same as far as I can tell. same mpg. i've put 4 or 5 tanks in it now and used seafoam in the first tank. i can't tell any difference.

maybe i'm just lucky, though.

i put 91 in my 89 regal 3.1L. made no difference at all.

Originally Posted by Shiftingshaddow

i have the supercharger. i bought the car about 2 months ago from a girl who used 87. it ran like a champ. i put 93 in it (the two stations i can find anything higher than 91) and runs the same as far as I can tell. same mpg. i've put 4 or 5 tanks in it now and used seafoam in the first tank. i can't tell any difference.

maybe i'm just lucky, though.

i put 91 in my 89 regal 3.1L. made no difference at all.

i got my 04 from the dealer and immediatly noticed it has 87 in it when i test drove, i went to the gas station and filled up with 93 cus it was basicly empty and as i was driving(my dad was in the car and heard it too) you could hear and feel the 93 kicking in. The car started running so much smoother and had more of a roar to it.

Our pcms sense what octane gas we are burning and run accordingly unless obv tuned otherwise. So you would def see gains from 93, i would try a tune up, replace pvc clean maf wire plugs fuel filter air filter ect.