slowmover, this tank was the first that I've kept average speed data on. It came out to an average of 29.0 mph. I agree with you that average mph will tell you a lot, however, there's still a lot it's not telling you. 1/2 20 mph, 1/2 70 mph is much, much different than all 45 mph (even though the average is the same).
Yeah, but I can look at your truck spec, and your description of your commute (or long distance trip)
and your average mph . . and I'll come away with some intuitive thoughts about my own. I already know that if I keep my mpg at or above 27-mpg around town that my mileage is excellent. Your actual mpg number (and mine) is the "skill difference".
Ready-made kit with install instruct
.