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Originally Posted by Afrersize
I'd rather get a biogas (methane) collecting system and extract from my relatives cows, and convert a car to run on biogas. The CNG industry really bothers me. By the way if any of you are wondering CNG and straight methane are different enough(at least according to my internet research) so to the point that they need different systems.
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With biomethane, a different filtering setup is required due to the impurities. After all, you could do some redneck-engineering with low-pressure systems and even mess with gas-bags, in a similar setup to what was used until the 90's in some Chinese buses.
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The only other fuel I consider for my fathers, now basically mine, broken Subaru Legacy(we suspect one broken piston rod) is methanol made at home.
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Either methanol or ethanol can be easily homebrewed. In Brazilian jails, it's not unusual for the inmates to make an alcoholic beverage similar to cachaça, but using corn, rice and fruit leftovers (mainly orange peel) instead.