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The problem with bi fuel systems is that the engine becomes extremely in efficient when running on natural gas. Natural gas has much high octane, lower energy content and takes up move intake volume than gasoline. A pure natural gas engine like the one found on the Civic GX runs much higher compression and completely different engine tuning compared to the gas engine.
The US has much more natural gas than than oil. There are massive deposits in the Gulf of Mexico and the Atlantic coast of Florida. Natural gas could replace oil if we had the economy incentives.
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