[MetroMPG]

Should add: some "proper" conversions don't need to be shifted. The motor is torquey enough and the rev range high enough that often people leave it in 2nd or 3rd gear for around town, and only shift up if they're going on the highway.

Shifting is better though if you want to try to keep the motor closer to its most efficient speed. Or if you don't have high enough voltage for top end power, like the ForkenSwift.