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I can believe it as I got 32.8 MPG in my C6 at 65mph, on a 2 hour highway trip with the windows down for part of the trip and the AC on for part of it, and I don't have the extra benefit of cylinder shutdown technology or the taller 7th gear. I've figured all along that the C7 should easily get way better gas mileage than the C6.
I agree that dont even make sense...I cant believe people are buying into this..30 mpg would be a stretch but 40!!! no way!!
Based on my observations with my OVERPOWERED LS7 with it's HORRIBLE aerodynamics, and WIDE tires, 39-40 MPG under good conditions is achievable with the C7.
Cruising at 70 MPH on level terrain, with no winds, no A/C on, I can rack up 30-31 MPG(hand calculated, not DIC readings) without breaking a sweat. Driving across Kansas in the very early AM, on I-70 at 80 MPH, no A/C, no wind and 70 degree ambient, my DIC will show 33-34 MPG(my DIC reads around 1.5 MPG high when checked against my hand calculated numbers).