Id go for one of the last of the e39's mate from just what i've read on the net and what i've heard from people,calling an e60 m5 thirsty is an understatment. Go for the 39 great car and fast as fooookk not too much harder on fuel compared to an e46 m3 either just make sure you get a clean one. ive seen a few dogs about
I was getting 22ish average on the M3, with 26+ possible on a long motorway run. 16mpg is the average on the M5, driving like Ms Daisy makes no real difference, and the fuel guage drops like a stone in traffic.