that's very nice of you Louis...
Aus government has now given a "green" rating to all cars sold here, Smart came up the most environmentally aware brand overall though the Prius was the best car model.
I still like LPG conversion, our last 4 cars have been LPG. The conversion equipment comes either from Netherlands or Italy. Not only is the fuel clean and cheap, also engine wear seems to stop when running on LPG. MY first LPG car was a Renault 20, when I bought it with 150000km, it had some engine wear and used a little oil. I expected to have engine rebuilt within 12 months. I had it converted to lpg at that time. I owned the car for about 5 years, sold it with 360000km on the clock, engine had not deteriorated at all. Same with my partner's Lada Niva, 100000km on gas with no engine wear. (Not much of a car though.) Then a Toyota Corona wagon 1985, converted to gas at 140000km, sold it to my neighbour at 250000 km, she stil has it with over 420000km and engine is still good as new. My current car, the 1993 Mitsubshi, was converted at 150000km, now has 280000km, head gasket blew which is common problem on that model but mechanic said the engine was still in very good condition inside, no need even to fit new valves. Taxis in Aus almost all use LPG and generally do between 500000 km and a million km before replacement, in Melbourne at least.
I'm not sure about other countries but LPG is very plentiful in Australia, natural gas even more so. The LPG used to be just burnt off at the refinery, before LPG conversions became more common. Conversion to LPG or CNG is good for the environment as it burns cleaner; good for the nation as it reduces the need to import middle eastern oil; and lowers maintenance, and cuts fuel costs to less than half.
Chris.