you fools ,i have fitted over 150 lpg kits and never had one go up ,as for cheap fuel , you do not get any detonation with gas at any given compression ratio, i think that you will find that the unleaded fuel is the cheap and nasty one. look at the tuning potential of lpg loads of boost and no detonation no melted pistons no broken rings,and a gas conversion if fitted correctly is safer than a tank full of petrol,admittedly the early lpg kits used to go bang but they used a crude mixer setup ,but nowadays they are very very safe ,if a petrol tank catches fire you cant put it out ,lpg tanks DONT catch fire it isnt possible ,even if the rest of the car is on fire,they vent out of a pipe in this situation ok the end of the pipe will be alight but it wont burn back to the gas tank,unlike a petrol tank which will explode ,youd have to get an lpg very hot to make it explode,doyou think i would consider fiting lpg if was dangerous ,let alone the 50grand motor homes i have converted ,do your homework lads