So my Fuel gauge only seems to be reading accurate when the a/c is running? When i drive around without a/c on the gas gauge is pretty worthless, it will say i burned a half tank at 90 miles and i will only have to put about 3 gallons in it to fill it back up. Then it will say im empty at 280 miles and i will still have a couple of gallons left. A couple of weeks ago i went on a 700 mile road trip and i found out when I run the a/c the gas gauge will work perfect, and will go to 340-360 miles before the gauge goes all the way down to red. My car is a 04 ep3, all stock.