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For what it's worth... The 2008 Honda GX engine is made for CNG. This engine has a compression ratio of 12.5:1. 12.5 to 13 is pretty safe, but I don't think there would be much benefit from more. I could be wrong... BTW... most modern engines designed for pump gas (87) are as low as 8.5:1 to 10.5:1 on the high side.
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