I had about 46mpg on the old 8v when I went to pick up the 16v donor, not bad considering I was doing about 77 all the way up including some traffic!
With the 16v I had 40mpg since Sunday morning, that trip is to Silverstone and then to Bournemouth, then back to Lymington, then back to Bournemouth and finally back home in Lymington, so just over 300 miles I believe. Not bad considering I rarely dropped below 80 and there was a LOT of traffic at Silverstone.