Which GMC Sierra 1500 gets the best gas mileage (mpg)?

The most fuel-efficient GMC Sierra 1500 is the 2014 GMC Sierra 1500 Base which gets 16 MPG City and 23 MPG Highway.

It is important to remember factors such as driving style, weather conditions, and the use of features such as Eco mode can impact fuel efficiency. Fuel economy figures are based on EPA estimates for when vehicle sold as new. Fuel economy may vary for reasons like driving conditions and vehicle history. Unless specified, figures are for vehicles equipped with an automatic transmission. See fueleconomy.gov.

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