The end all thread on class A gas mpg with v10

I don't bother to figure out my "fuel economy", even though I maintain a log book of every fill, and the odometer reading when it occurred. It would be quite easy to compute the MPG between fills, or even the average MPG since we bought the rig.
But, IMO, why bother. I know that "fuel economy" and "motorhome" are mutually exclusive terms, and should not even be used in the same sentence!
It gets terrible gas mileage. That's just the way it is. I do not need, nor do I want, the exact numbers.