Best for Going Emission-Free

Zero FX

It's the priciest bike here, but the FX is inexpensive by electric-motorcycle standards and may cost less where you live, as some states offer incentives. Plus, operating expenses work out to a penny or two a mile, and oil changes, as well as the maintenance associated with traditional bikes, are unnecessary. Way more Porsche than Prius, the Zero's electric motor delivers an instantaneous 70 lb-ft of torque. Since it's clutchless, the FX is a cinch to operate. Its battery offers about 35 urban miles per charge. [$9,495; zeromotorcycles.com]