[MetroMPG]

Definitely. There are several styles available, some quite easy to make yourself, and the guy who made the one I'm using posted a schematic & a parts list.

I just recharged the car this morning (Ivan's had it for the last week or so): best ever efficiency: 126.9 mpg-e. Or 264 Wh/mile. That's really good! Mostly it's the warm weather, and the fact that the car was fresh off the charger before driving & recharged immediately after.

I'll have more runs than normal in the next few days as I use the new batt monitor to swap batteries around and make up the best possible pack from the floodies sitting around here.