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#16
06-17-2022, 03:06 PM
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Geez, I have a 2020 GMC HD2500 with 6.6 gas and I love it. It looks like Im getting sbout the same MPG (14 and 17-18 HWY) as the 2022 Duramax. It says my best mileage was 19.6 for 50 miles.
The 6.6 gas engine is totally an upgrade from the previous 6.0.
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1969 Camaro RS/SS Azure Turquoise 1969 Camaro Z/28 Azure Turquoise 1984 Camaro z/28 L69 HO 5 speed 1984 Camaro z/28 zz4 conversion 1987 Monte Carlo SS original owner 
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