A recent long trip to scotland for a holiday produced some very good mpg results (brim to brim). Trip up there gave me a brim-brim average of 49.8mpg, and the 300 odd miles I did up there before filling to come back down resulted in 58mpg! Considering I had a box on as well, I'm more than happy. I know that the recent spell of warmer weather, lighter traffic where we were (which enabled me to cruise around at ~55 or so) + the change over to summer diesel probably helped, but still very good!