Its funny you said that...I took smudge back to the dealer three days after getting him and he had a little less than half a tank left and the TC showed a range of 150 miles, he also had 307 miles on the clock. When I got him back he had 330 miles on the clock and the TC had gone down to 65 miles, the tank was at a little above the 1/4 full mark. Now I understand one of the issues was related to high speed driving (above 50mph there was a definitive steering wheel shake), so testing may necessitate going for a spin on the motorway. But 23 miles???? Hmmm! maybe something to mention to the garage next time I see them. I was also a bit dubious of the fact that 23 miles had used nearly a quarter of a tank....I wonder if the running in procedure has been slightly violated?? (and not by me!)