Image 1 of 10 from The three-wheel, 225 mpg plug-in hybrid XR-3 kit car

March 21, 2007 Robert Q. Riley’s radical high-efficiency designs, concepts and kits have been public for a long time, and have often been viewed as non-mainstream and largely irrelevant by an American population with a highly distorted view of the real cost of cheap petrol. Now his fuel-efficient designs seem suddenly relevant – we desperately need new transportation alternatives that conserve energy and protect the planet’s ecosystem, Riley’s latest creation, the XR-3 plug-in hybrid, is a sleek two-passenger, three-wheel sports car that is expected to return 225 miles per gallon. Designed to be assembled by someone with average mechanical abilities and no prior experience, the all-wheel drive vehicle will be available as a kit or plans for complete do-it-yourself construction. The XR-3 Hybrid is currently under development and is scheduled to debut in June 2007.