The new 2020 GMC Sierra is a new contender amongst pick-up trucks, and there's been a lot of curiosity about the fuel economy of the new revamped Sierra. Let's take a look at the fuel economy of the various trims under the 2020 GMC Sierra: 

2020 GMC Sierra

For the GMC Sierra with the 2.7-liter, 4-cylinder engine, an automatic 8-speed transmission, the EPA ratings for the fuel economy measure out at 19 mpg in the city, 22 on the highway, and a combined score of 20.

However, if the engine is replaced with a 5.3-liter, 8-cylinder...continue reading