Most gas stations here in the UK have LPG. You get less milage to a tank full, the price is cheaper, although the government have added tax to make it only just better, LPG was once dirt cheap, i understand it's a waste product you see being burnt off at the refinery.
Years ago when i worked for an engineering company there was an engineer who was driving around with a propane tank in his boot, he did the conversion himself, this is way before it was even considered for auto use, he was way ahead and he said it was way cheaper than gasoline even back then but i guess they had not put tax on it at that point, someone else once said the cheapest was was to buy a super huge bottle that the roofing guys use to heat pitch and pump that in the car.
The big thing in the UK for the last 5 years is bio diesel, any restaurant/ chip shop uses canola oil, they once had to pay to get the used stuff dumped, now people call round with Lorry's and pick it up free, who knows they may even pay the restaurant for it these days, they take it back and convert it into bio diesel, i wonder if that has yet taken off in the US? if not there's big opportunity's there guys.
Propane and Butane are bye products of oil, methane normally is natural. In the UK, can't remember where Propane and Butane was stored underground making the ground frozen all year round, this was because there was a glut that they did not know what to do with it, being a bye product of oil refining something had to be done, so into the ground it went I suppose we should all take up hot air ballooning and create a lot of hot air to use it up Mike
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