In UK LPG is quite widely available?
We don't have that option in here and there is people that can't afford costs converting a car.
What options are for LPG, at least Ethanol is one that is gaining more and more attention, but maybe even more interesting one is Vegetable oils.
I found that this site here has links to lot of information from these two:
http://www.freedomtowns.com/transpo.htm
Funny thing I did found out is that it is possible to use these to just more than a fuel, you can use biodiesel as fuel addittive and also instead of 2 stroke oil.
I would be very interested to get fuel that I could make myself and use it in moped or similar small engine to get very cheap transportation around city and with relatively small expenses
Of course our goverment is not supporting these fuels, instead you get ticket if police finds out you are using something else than pump gas or diesel, but that has not stopped revolution before


