tivoboy
Active Member
Missed it by 1%.. ;-)They do drive it for hours, but it's on a dynamometer the entire time. The 5 cycle test includes hot and cold along with higher speeds.
Hard to game when EPA controls the variables. Coast down can be verified, so it's only the adjustment factor that can be tweaked.
70 vs 55 is 62% more aero load. Of course, aero is not the only load, rolling is in play also and that's fairly constant on a per mile basis. If aero started as 1/3 of the energy usage and Wh/mile were 240:
80 Wh/mile aero * 1.62 = 130
160 Wh/mile rolling = 160
Total: 290, for a 21% increase in consumption or 21% drop in range.
I do think that EPA does a driving test for EPA EV range testing and not just on the dynamometer..