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Horrible Gas Mileage on my 2003 GT

407 Views 4 Replies 3 Participants Last post by  Dburwell
Hey guys. First post. I just bought a 2003 gt at the beginning of last month. After getting used to it, I've noticed that I've been getting really bad gas mileage. I've read that im supposed to be getting close to 18/26 (I know that being pretty generous) but I've been getting about about 12 mpg combined. My car has 83,000 miles and I've been running mid-grade gas through it. I just bought new tires, spark plugs, air filter and a fuel filter yesterday and I'm hoping that makes some kind of difference. Any other suggestions? Thanks for the help!
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i used to have a 99 v6, that only got 19 mpg highway, about 12 city with new plugs, wires, and filters. I ran a can of seafoam in it 2-3 times and it improved abit, but nothing near what its suppose to get new, but thats just it, its a used car, their is to much buildup and **** in the engine to get "new" mpg, and also note the 26mpg highway is at like 45 mph for the test, while going downhill, in like a vacuum tube so no air Resistance :p
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