At $4550, the Power Boots system transforms “any conveyance with 15-inch wheels or larger into an electric engine-assisted greenmobile.” The Poulsen Hybrid attachments bolt onto two wheels, providing 70% – 85% of the power needed for everyday driving.

The car’s gasoline engine provides the other 15-30%, needed for stops, starts, and acceleration. It’ll cost you $4,550 (for the lead acid battery model) to have a pair of these power boots installed on your car, or a stiff $8,600 for the ones with lighter lithium ion batteries on board.

[via Dvice]