Question: is lpg cheaper than petrol?
Answer: As we mentioned earlier, LPG is roughly half the cost of petrol, that's due to a lower fuel exercise duty. Petrol and diesel are charged at 57.95p per litre, whereas LPG is only 31.61 per/kg. That translates to an average of just 60-67p per litre compared to £1.25 for petrol.