Good evening all! Back again after buying a new car. I've got a p38 4.0ltr on LPG and wanted to know what sort of miles I should be getting? I've got duel tanks one in the spare wheel well and a big one in the boot. It takes 99.98ltrs around £61 to fill. I thought I was getting around 470 mile as didn't fill it for 5 weeks after a trip to Cornwall but after checking I think I only got 250. Any ideas?