Exalt your math is a little off on the BYD post above. The LPG truck will use around 2.5kg per hour (assuming 2.5ton truck) but the cost is £0.50 (generally its more than this) for a litre, which needs multiplied by 1.98 to get 1 kg. So the running cost for a 2.5 ton LPG truck is typically around £2.50-£3.00 per hour.