What a difference in MPG you get from 'normal' city driving and short 20mile journeys here and there compared to say 2 x 250mile trips on the mway!
I thought there was something wrong with my car over my 3 weeks of around xmas, pottering around Soton and Pompey, only managed 500 from a tank and about 48mpg at best!

Just had a 200mile drive back from Lincoln to Soton...Got 53mpg cruising at 80ish on the mway, really pleased and car is back to normal! I thought I was going to have to chase a MPG issue!
