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DEF. check a few things like stated above. Are your tires stock size? If not, your odometer reading will be off. Use a GPS or good ole fasion mile markers on the side of the interstate and figure out how off it is, then use that when you calculate your mileage to get a closer to right number. Both my truck and Escort read low so when I recalculate I gain a smidge! Also, check plugs, wires, airfilter, fuel filter, bearings, brakes (are they dragging), Parking brake etc. The Escort wouldnt warm up in weather cooler than 40*, even on a long drive it would barely warm up enough to get any measurable heat thru the heater. A simple thermostat swap made that go away!!! Vacuum leaks can wreak havok as well. Keep on it, dont loose faith. Another thing you might try is to drop all your techniques for a couple tanks and see how much lower your MPG is. Keep your head up!!!
Matt
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