Your MPGs will soar in the summer when the weather gets better, and when the school hols are on. I'm next doing an M8 roadtrip to the throbbing metropolis of Kilmarnock on Monday so that will be the end of that tank so I can check - so far the second bar (usually about 190 miles) is still on at 193.
More low costs too - just ordered 2 new tyres for the front. When I bought a tyre for the Fabia it was £140-ish. The two cost me £55, and they are Uniroyals not Widowmakers