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...the best mpg they got.? best mpg some one has gotten with a 2003 grand am with the 3.4 motor and how far they got on a full tank of gas getting ready for a long trip to what ill be spending for gas
 
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I had a 99 gt, 3.4. I don't think I ever got above 15 mpg.
 
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i have a 01 gt, and with everything i have done to it, i get about 35 mpg at about 75, with the cruise set. but if your car is 100% stock, then i would say about 30 mpg. you can probably get in the 350 mile range on a full tank. by the way if you want to figure your mpg, your gas tank is 14.3 gallons.

hope this helps, have a safe trip.
 
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