rooster beat me to it; I've been thinking about that 17mpg Chevy and the first things I would do are check highway mileage, it should be close to 30. Then, especially if it isn't, I'd look for a dragging brake(s) both by jacking up each wheel and giving it a whirl, and by going for a test drive out in the stix so that you can get up to speed then coast to a stop USING NO BRAKES then get out and feel for a hot one. Maybe it's time for sparkplug clean n gap or replace, and other tune-up items. rooster is also right about the colossal waste of money new vehicles are.
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