With the math, I chose a 3,500 Watt motor and four high capacity, lightweight batteries. The intention was to merely provide the 4.55 horsepower (~3,400 Watts) to help maintain speed. You could also use a less powerful motor with a longer run time but would obviously get less assistance. The Elio will be more aerodynamic than you on a scooter, I'd bet. I don't discount real-world examples though. The college used $3,000 in parts to build their hub motor based hybrid conversion kit. Check this out - http://www.torquenews.com/1075/mtsu...diy-plug-hybrid-conversion-kit-nearly-any-car This would be a bit cheaper on the much lighter, single rear wheel Elio. I was just trying to make about the same thing with off-the-shelf parts. However, I much prefer the College's setup. Think if someone made a version of that for the Elio with, say, 30 minutes of drive time or maybe an hour. Most commutes are less than that. I know that you can't save enough fuel to pay for the mod but it'd be fun anyway. Imagine a 200 ft. lb boost!