I Drive 1,000 Miles in the 2020 Chevy Silverado HD To Find Out If The New 10-Speed Gets Better MPG!

( http://www.TFLtruck.com ) We Drive 1,000 Miles in the New 2020 Chevy Silverado HD 2500 Duramax Diesel: Here Is How Efficient the new 10-Speed Allison Transmission really is! (   / tflcar   ) Please visit to support TFLcar & TFLtruck. Check us out on: Facebook: (   / tfltruck   ) Twitter: (   / tfltruck   ) The Fast Lane Car: (    / tflcar   ) and classic cars as well at: TFLClassics: (    / classicsunleashed   ) #chevy #silveradoHD #duramax