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Help Please!

1535 Views 13 Replies 13 Participants Last post by  Gig4Fun
Ok HERES THE DEAL just got my car about a week ago....had about 63 miles when i got it, and now has about 480. Ok my mpg is 12.1. Im finding most of the GT owners around here getting at least 14 mpg. I was thinking it was my tires. I checked and their psi was about 30-32....:?: SO i went to my local gas station and pumped them up to about 40 infront and 39 in back. Is this good..or should i lower the psi alittle? Could that of been my MPG issue???? thankyou!!:wavey
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psi on tires or is it octane

PSI settings for the stock tires are printed on the sticker on the inside of the door... if you have stock 17" I think it's 32 all around... double check with the sticker.
Quick question:
What octane fuel are you running? - reason I ask is I saw a guy over at Edmunds forum who was running 93 octane (no aftermarket tune) and was getting like 10-12mpg. I told him to switch back to 87 and see what happens.
Quick comment:
My 06 owners manual say during first 1000 mile break in do not expect to get a good or constant MPG.
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