It always has ever sence we bought it new in 2005 it gets worse gas milage than my 1999 z71
bad gas mileage
Bad gas mileage can sometimes be attributed to a vehicle in need of a tune-up. Have your car serviced and see if that improves the gas mileage.
Yes
hummers
yes
Yes it can reduce gas mileage. There are usually two kinds of faults with FPR that reduce gas mileage. 1. Excessive fuel pressure. 2. Fuel leaking through vacum. Both these faults result in bad gas mileage.
bad
Yes it certainly could cause bad gas mileage especially if it is plugged up or if your car's oxygen sensors readings are faulty.
YES YESYESYESYESYESYESYES
That depends if its a v8 it would be most likely to be bad on gas v6 is a lot better on gas mileage.
A bad O2 sensor can affect gas mileage. It is an emissions sensor, so when it goes bad, it does not reflect emissions performance on the car, which could cost a lot in gasoline.
Yes.Yes.