These two pickup trucks look similar, but are quite different. One has a 5.3 liter engine, and the other one has a mighty V8 6.2 liter under the hood. In case you were wondering, GMC Sierra is the more powerful one, but how will that affect the mpg? Click on the video and find out which car has the better gas mileage, which one is faster, and so much more in this amazing review.
Crazy!! Be sure to check the out next video below.