Plug-In your hybrid with Solar panel and improve your gas mileage to reduce your carbon foot-print with Enginer add-on Lithium battery system. Join over 1000 hybrid owners to enjoy 70+ MPG experience. Save up to $3500/year on gasoline cost. By using electricity from the grid, your gasoline consumption will be reduced significantly. The cost for the electricity cost around $0.40 per charge. It is equivalent of $1.00/gallon of gas. There are only two low voltage and two high voltage wires to connect.