What is the gas mileage for a GMC truck 5.3L?

Answer by  Amber40 (24961)

To tell you the gas mileage I would need to know the year, make, and model of the truck. Mileage will vary greatly depending on the transmission and vehicle weight.

Answer by  Amber40 (24961)

Well without knowing the year and model of your truck it is impossible to say. If I knew this information I could consult the government's fuel economy site. You can do so yourself though. Just look up the year and model and it should list all engine and transmission combinations.