I ran it on my LDV V8 service barge, made the van cost eefectiv enough for use daily, and i dint do alot of miles at all, the fact its over 50% cheaper the conventional fuel and you will use more per gallon than on petrol, but nothing like 50% more, the calorific value of LPG is less than petrol, so you need to burn more to get the same energy from it, i reckon on no measurable power loss, but got more like 3 mpg less on gas than on petrol, but the engines also run smoother on gas than petrol !