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IF YOU WANT SOMETHING DONE RIGHT: Can you put together a more fuel-efficient car than the automakers have? An automotive designer has developed a kit for a three-wheeled plug-in hybrid electric vehicle with a 64-km all-electric range. The XR3, which can cost up to US $25 000 to build, boasts fuel economy exceeding 1.18 liters per 100 kilometers (200 miles per gallon) when running its diesel engine and electric motor in hybrid mode. <