Hi I've been running on LPG for 400,000 miles or more and on several different systems. The one I have now is about the best I've had. It's called Romano. It gets the most out of the LPG by heating it super hot just before injecting it and the power loss is no longer an issue. I get about 20 mpg on LPG and it's less than half petrol price. I use a valve saver head and valve lube system from australia to stop valve recession. The only down side with lpg is very slow fuel fill ups and on my setup it fills the back as I have a 120 litre tank behind the seat. ( steal tank very strong and definitely more crash proof than a petrol tank) if I run out if LPG it beeps and changes to petrol. If I press hard on the accelerator pedal and make a higher power demand than the LPG can meet it seamlessly switches to petrol then back to LPG after.