Long-term MPG Update on My 2024 GMC Sierra 2500 HD Gas 6.6 L8T & Allison 10-speed
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YouTubeAdventure Rocks
Long-term MPG Update on My 2024 GMC Sierra 2500 HD Gas 6.6 L8T & Allison 10-speed
By request I share my long-term MPG over nearly 7K miles of ownership driving the 6.6L L8T gas engine in my 2024 GMC Sierra 2500HD. This is of course the same exact engine and 10-speed Allison transmission combo found in the Chevy Silverado HD trucks. If you didn't catch the previous 3 MPG runs both unladen and towing, here they are: Gas MPG ...
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