DIY Plans for Plug-In Hybrid XR3

Robert Q. Riley Enterprises, a product design firm in Glendale, Ariz., announced the release of construction plans for anyone who wants to build its XR3, a two-passenger, plug-in hybrid that can travel up to 225 miles per gallon.

The three-wheel sports car's modular design can be outfitted with different power trains to create a 125-mpg, diesel-only vehicle; a 100-mile-range, battery-only vehicle; or a hybrid for increased performance and fuel versatility.

Since no computer controls are needed on the hybrid system, costs are reduced and the need for re-programming is eliminated.

"During the two years it took to develop the XR3, we received more than 2,500 advanced order reservations for the plan set," said Robert Q. Riley, company president and author of "Alternative Cars in the 21st Century."

In addition to conventional printed drawings and instructions, the do-it-yourself plans include electronic 3D models that can be viewed on an ordinary PC, computer files vendors can use to make parts, and a DVD that shows the car being built.