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Re: 2001 5.3L gas mileage/power
My first response (since I've just had this experience) is to change your fuel filter. My 2000 Tahoe, same setup as yours except with the 5.7L was getting 17.8mpg hiway and 14.6mpg city when I got it with 42K miles. >>>---- Long story short ----> I put injector cleaner in the tank and my mileage went to 13 and 11. Changed filter and back up to 13city and 16 hiway (larger tires now, too).
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