Lately my 4.8L (all stock) silverado has been getting really bad mileage, it used to get 15-16 or higher city driving, but it now gets around 12-13, almost like a switch was flipped it just got horrible gas mileage. my buddy thought it was a fuel filter, but i read that you had to get a whole new fuel pump on 2004 and up models. not sure what it is but i would like to get it back to the 15-16 mpg asap. any help with this would be lovely. thank you very much and have a Happy Thanksgiving!
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You just noticed it recently? Like when it started to get into winter? Gas stations switched to winter blend which usually causes a couple mpg loss. I know I was at around 15 hwy and now on my last tank or 12.5 hand calculated. Nothin has changed with codes or anything? How many miles?
I will check my tires, and the air filer, how would bad shocks rob fuel economy? And do you think a fuel filter would be a cause? And ive heard that they are built in to the pump, is this true? Thanks again