Last week I did two trips to Gatwick airport and back from Grantham (364 miles in total), two trips, three people in plus luggage, the return journeys just me. Then another 180 miles from Grantham to Bradford, stopping at Barnsley on the way back, still had 60 miles left in the tank, but got about 15miles out of it before fill up as it was town driving. MPG at 49.7 in a 1.4 16v Mk3 Dynamique at more or less 60/70mph for the entire time though.
Nearly 550 miles on a full tank last week. Not bad for a petrol car IMO, best I've EVER done.