Thinking more about this as prices continue to fly out of control. People have run cars on compressed natural gas or propane for years, a little less horse power, but with the right equipment you can actually pump it from your house for under a buck a gallon or gge (gallon of gas equivalent). Supposedly the install is easy if you have a carbed boat (I do) but more expensive if you're efi, but they make trucks, vans and busses run on the stuff. I was just reading about the stuff today, and I'm not an expert at all, but maybe somebody on here knows more.
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