Honda FCX Clarity
The fuel cell in this economy friendly vehicle combines hydrogen with oxygen to make electricity. The electricity then powers the electric motor, which in turn propels the vehicle. Water is the only byproduct the FCX Clarity leaves behind.
 Based on 2009 EPA mileage estimates, reflecting new EPA fuel economy methods beginning with 2008 models. Use for comparison purposes only. Do not compare to models before 2008. Your actual mileage will vary depending on how you drive and maintain your vehicle.