Whisper number is 35mpg highway, of course this will be dependent on a number of things. Longer crew cab models allow for more air turbulence and drag under the vehicle reducing mileage, final drive ratio, and whether it is 2 or 4 wheel drive model. And I still haven't read which diesel engine will be installed, the 2.5 or the 2.8 Duramax that are offered elsewhere in the world. Personally, I think that with number 2 diesel and a soft right foot you'll come close to the 35mpg number, but we'll have to wait another 5 to 6 months for more details. Based on how the Colorado / Canyon are selling, with dealers unable to keep more than a handful in stock, if you really want one I suggest you get an order in early with your dealer.
