Cost is just under $20,000 and the Roadster is eligible for a $4,000 federal tax credit. The retail price includes a home-refueling appliance that operates on the principle of slow-moving hydraulics. Other home-based refuelers have high-speed valves that are electrically operated. Jerry Hendricks, company CEO, says the hydraulic refueler doesn't build up heat and hardly needs maintenance. The refueler fills up the 5-gallon tank in the trunk of the Roadster. It feeds a water-cooled,4-cylinder Boxer-style engine that is designed to run on CNG. In other words, it's not a gas engine converted to run on CNG. It features a higher compression ratio and plumbing dedicated to compressed natural gas. Range on one tank of fuel is about 700 miles.
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