BigM wrote:

Hi

My way of thinking is if I'm paying 72p per litre for gas, but loosing 20% efficiency compaired to running on petrol then I am running my car as if petrol was currently costing 86.4p per litre (as I'm having to use 20% more fuel to cover the same milage).

i.e 72+20%=86.4

Are my calculations right?

So to travel the same distance would use 20% more gas than petrol.

If my car used 10 litres of petrol to cover 100km then it would use 12 litres of gas.

If LPG MPG = 80% of Petrol MPG then;

LPG is 80%, to get to 100% would be:

LPG price: divided by 4 x 5, divide by 0.8 x 1.0 or x 1.25 (+25%)