there's a lot to consider when youre getting bad mileage out of your car
when was the last time it had a tune up?
change oil?
dirty air filter?
clogged fuel filter? do you let it down the 1/4 tank of gas?
maybe sum of your spark plugs are burnt
what about your 02 sensor
clogged exhaust?
blown head gasket? jus kidding hopefully not.
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