bad gas mileage

  1. C

    Slight miss but 6 mpg!!? Need help

    Hi guys thanks for the add to the group. I’m having a real hard time trying to figure out what’s wrong with my 2008 GMC Yukon XL 5.3 4 x 4. I have a slight miss but no codes. I replaced everything in the evap system. Purge valve. Charcoal canister. Vapor canister vent valve. (Pump at gas station...

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