Probably not a symmetrical bell curve but certainly 0.01 mph is NOT the most efficient speed.
Look at it this way. We know the car can go 700 miles on a tank. If driven at 0.01 mph it would take 70,000 hours to go 700 miles. That is almost 8 years! We know a tank of gas, even if the car is left in park will not run the car for 8 years.
The problem is the car uses some energy just to keep itself on. Even if you turn off all the optional assessors you still have a lot of electronics to keep powered up such as the power control module, battery control module, transmission control module, OBDII module, anti-lock brakes, DC to DC controller, power steering control module, instrument panel control module, etc. In addition you have the battery cooling fans, and all the energy lost charging and discharging the battery if you never use the ICE to make the car move.
My guess is it wouldn't be a single speed. The most efficient speed would be one speed when running ICE and another speed when running EV mode.
Edited by Automate, 28 April 2015 - 10:16 PM.