Slightly off topic...
Is anyone aware of a combination of the Hybrid Fuel / Electricity cars (e.g. Prius) using LPG for the Fuel part of that?
A colleague of mine in the US had a Prius and was proud to point to 42mpg - I get an average 46 with my 2.4 litre diesel, so wasn't too impressed on the ecological benefits of the Prius, but if you could combine that with LPG, it might be a flyer...