[bsder]

Wind drag goes as something like the 4th? power of velocity--so highway speeds are a function of how aerodynamic you are (and everybody pretty much is) and how efficiently you convert stored energy to wheel torque (and at highway speeds at 2000-3000 RPM ICE is pretty much at max efficiency).

Your ICE commuter is burning lots more gas than any electric/hybrid if you are stuck in traffic at low speed for any amount of time.