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 with Allison 10-speed
   • MPG Test // I Drive 400+ Miles with M...  

Highway MPG Test with GM 6.6 L8T
   • I Try Again...Highway MPG Test with M...  

Gas 6.6L L8T Towing MPG
   • I Tow with the 6.6L L8T Gas Engine in...  

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