Most hybrid car drivers are familiar with the idea of in-car graphs that display energy usage. In a hybrid car that sort of thing is nice to know. It can help a a driver make the most efficient use of the vehicle and it's fun to show off to your friends.
In an electric car, though, it's more than just interesting. It can be critical. In the Nissan Leaf, a computer displays not just the remaining driving range -- 34 miles in this case -- but offers tips as to what accessories could be turned off to extend that range. In this case, just turning off the air conditioner could extend the car's remaining range to as much as 44 miles.
NEXT: How far you can go
Last updated October 08 2010: 11:03 AM ET