I recently bought an old business owned truck that had a few problems that i have been trying to fix but i have noticed my fuel mileage has been dropping since i got it. it used to be near 15mpg, but the last i checked it got 8.6mpg. IAnd what really gets me is that the check engine light hasn't come on. It my be a little off because its winter and i idel more but it shouldn,t be that bad. I have new spark plugs and wires, new air filter, new fuel filter, changed the oil recently. I think it has most of the factor parts on it to. My guess is a sensor/s. and one more thing one of my catlytic converters is no more. its not cloged its completely empty but i heard that O2 sensors only can change mpg by 15%. I have no way to test them either and i realy don't have money to have a dealer look at it.
Jan 31, 2010 at 1:15 AM