Fuel Comsumption calculus
Fuel consumption is affeced by a variety of factors. BUDSVET you probably have the best indication of an overall road mileage indication over a variety of terrain and altitudes. I am very impressed with the fuel consumption on my XLR.
Ultimately the calculation is miles driven divided by gallons used. If Dadonator is really getting 9 mpg in NYC, it is probably because he's driving 10 mph, stop and go, light to light, with lots of stops.
A guy at 5000 feet in Denver or even higher in the Rockies is just going to get worse mileage than I am at sea level (less O2 up there).
I would say your XLR is not a lemon, amigo. :thumbs Glad you like the Invisishield. You got a better deal than I did. Mine was $650, and no six-pack. They did a portion of the hood, fenders, front end, front bumper, headlights, fog lights, mirrors and the trailing edge of the wheel wells.