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Originally Posted by swilbee
Thanks for your welcome, and reply.
I figured on the o2 sensor, but wouldn't the service light come on if it's really bad?..at least bad enough to give off THAT poor mileage.
Gas filter should be changed. Should have done that with the tune up...do that tomorrow!
Could improper tension on the serpentine belt cause poor mileage? There is a slight squeak, and the belt shows NO sign of wear.
How about a cold air intake? Would I gain more mileage? And those gimmiky 'Cyclone' intake things. You know...aluminum cylinder that is suppsed to enrich the air. Anyone see results with one of those?
Either way mileage is calculated...155 KM on a tank...not good at all!
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I didn't quite understand if you said that you did a complete tune-up with spark plugs wires, pcv valves, air filters and all that. Do you still have the factory size tires on. You might also need to change your level octane o gas