DIY mechanics can now build a Hybrid to save some bucks and help the planet. The XR3 holds two passengers and can get 125 mpg on diesel and 225 mpg when combined with electricity. Weighing a mere 1,480 lbs., designer Robert Q. Riley promises fast acceleration and a maximum speed of 80 mph. With a clam shell canopy and three-wheel platform, use battery power alone for up to 40 miles distance. You can build the XR3 in a diesel only model for less than $10,000.00 while a Li-ion version can cost up to $25,000.00. Plans will set you back $170.00 to $200.00.