How expensive is fuel on motorways? Visit petrolprices.com website. More Posted: 181105 If you refuel on a motorway the price can be painful For example the current price for petrol at Tebay services on the M6 near Shap is 149.9p/litre but if you turn off at Junction 38 just a few miles south before reaching Tebay services and head for Tebay village there fuel is available at 130.9p/litre. So filling an MGBGTV8 12 gallon tank there could save over £10 or 12% less than at Tebay.