Try and do the math on this as you have to factor in your average consumption, yearly distance traveled and the cost difference of the fuel to determine your returns if you convert to LPG.

Before we decided to convert, we were discussing between converting our old Galant V6 or our fairly new Corolla Altis. We decided to convert the Altis as this would be used more often and with an average travel of around 15,000kms to 20,000kms per year, consuming 10km/L, the LPG install broke even before reaching two years.