Quote:
Originally Posted by bikin' Ed
 Wouldn't infinity be your theoretical max mpg? i.e. going down hill during EOC. Trying to factor in grade, road surface, weight of vehicle (how much fuel, how many passengers, cargo) air speed, wind speed and angle  and whatever else I missed, how can hope to get even a formula for max mpg? |
Maybe theoretical wasn't an optimal term to use to avoid confusion. Perhaps practical max? The term theoretical is used to find the maximum possible performance of a system (always less than 100%). It's not so much a formula in this case, as much as it is a method to test.
Passengers and cargo wouldn't matter - the maximum possible will be without things you don't carry around all the time. Adding these things will reduce current efficiency further away from the practical/theoretical max.