Quote:
Originally Posted by sendler
Saying that you are running the speed limit doesn't tell us anything.
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Neither does the actual speed tell us much, unless we know what the road's like. For instance, I drive one stretch of US 50 quite often. (Several times a week in summer.) Going west, I will be going 45-55 mph, and getting about 30-35 mpg. Going east on the same road, I go 55-60, and get 150+ mpg (essentially infinite, as it's in DFCO mode). The trick is the 6% grade.
That's why claiming mpg on particular "runs" can be pretty misleading. Start at the top of a mountain pass, or have a good tailwind, and you can get pretty impressive mpg. I've posted a picture some time ago, showing 150 mpg over a "run" of 69 miles, but I didn't get anything like that going back the other way :-)