Join Date: Feb 2012
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Are you driving a 4 or 6 cylinder, do you have mechanical or hydraulic lifters, mileage in total, oil changes and grade, auto or manual shift, brakes clear, clean, not dragging, if auto shifting correctly, have you cleaned the throttle body and air filter, EGR, mass air flow, IA control, is the engine carbon clogged, cleaned the O2 sensors...
All these things can play havoc with MPG, but first...do a proper test to see what MPG or liters/hundred you are getting. Guessing is not the answer. If you have a tach, use it, see if shifting automatically is within the econo range, not the power range. You must test the car for slippage, for stuck brakes, for excess baggage, for obstructions, then check the timing, the compression, leak down. With more info then you can decide if you are wasting gas. And remember Winter is colder, you burn more gas to start, run and warm up.