More of the same but it was interesting to note that they averaged 18.6 mpg during their testing. That's 1 mpg more than the Duramax they had last week for reference. They had a Platinum Reserve. I bet that front air dam causes it to get better mpg than the Pro4x without.
https://www.youtube.com/watch?v=N3hxcN2vGww
https://www.youtube.com/watch?v=N3hxcN2vGww