g'day my VL wagons on gas and its the carby type... out of a 90L tank i can get over 450km out of the tank if i dont drive to spirited and at $40 to fill the tank thats prety cheap. you do loose some power out of gas and it is noticable but when its half the price it doesnt matter. if you get the car tuned to run dedicated LPG, ie. change your timing, up the compression ratio to about 13:1 due to the high octane rating..etc... you can get alot better economy and more power and if its dedicated gas you can save sum weight by taking out the petrol setup. even better go gas injection as well as up the compression ratio and it is easywe to tune and is even more economical.. just my 2c