Black'03GT said:Mobil/Exxon only. I don't trust the cheap gas
So I just use a midgrade. Anyone have any input? 
Brisk281GT said:Shell, I just throw it on the Shell card. I use 89 on the stang. I used to use premium (91) but I have heard from some that it is not good to use the higher octane fuels unless timing is incresed.So I just use a midgrade. Anyone have any input?
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But now i use regular since i heard it wasnt good to run higher.I always use 89 octane atJason94gt said:Chevron
I've had more than one reliable mechanic at ford dealerships tell me that higher octane shortens the life of 02 sensors.Brisk281GT said:Shell, I just throw it on the Shell card. I use 89 on the stang. I used to use premium (91) but I have heard from some that it is not good to use the higher octane fuels unless timing is incresed.So I just use a midgrade. Anyone have any input?
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