6.0l vortec vs 8.1l with allison gas mileage
I'm considering the purchase of two different trucks. Has anyone had experience with comparing the gas mileage for a a 6.0l vortec vs an 8.1l paired with the allison transmission?? For my purposes...
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If I remember correctly, the 6.2 didn't come out until '09 for the Denali, and '10 for the Silverado.
Understand the '09 wih the 6spd trans is a different animal compared to a 4spd 6.0 truck.
Understand the '09 wih the 6spd trans is a different animal compared to a 4spd 6.0 truck.
