Just wondering if a tonneau cover would help with better gas mileage with my truck?
Truck is 2005 GMC Sierra 1500, ext cab, 4x4, Z71, 5.3 L, everything is stock.
I signed up to fuelly.com to start documenting my fillups/mileage, and was shocked at the first total for 13.X mpg, or 17.X L/100km. I live in a small town and the main driving i do is on country roads at 80km/hr, and through town, 50 ...

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