[culopatin]

“That kind of drop” makes it sound like they’re doing something wrong. The EPA test is done at 55, so it makes sense that you get the same number under the same conditions of the test. And since energy usage is exponential vs speed, anything faster will show fast. If they live in hilly and curvy, add that to the math and you’ll find that it’s more likely that you’re the odd ball and will be asked “how slow are you driving to get that kind of mileage” instead.

Don’t know where you live but it’s rare for traffic to move at 55 in many places. Either in city 25-45 or 65+ highway.

It is totally legal and fine to drive the EPA 55mph in places where traffic normally moves at 70, but must also recognize that when semis have to go around those vehicles, they cause ripples through traffic every time and increase risk of collisions for everyone.

[schiffern]

  >And since energy usage is exponential vs speed

Doesn't energy usage vs speed scale as O(n^2), not O(e^n)?