Thanks for replies, I hadn't considered battery voltage and thought it was some kind of electronic timer that controls the shut down on Ecomode. A bit strange as the battery seems fine, starts instantly on winter mornings. To DaveHerns the model is a 2010 1.6hdi Airdream, 5 speed manual. Perhaps I have been lucky, but speak as I find the car has been trouble free in 27k miles an gives me the ideal combination of comfort, performance and economy. I have had 60mpg on 130 mile round trips on duel carriageway roads, but 52 mpg is a more realistic figure in give and take motoring, I actually get better mpg than from my wife's C3 1.6hdi which considering the size of the C5 is pretty good. I like the styling too, parked next to the latest Jaguar it stands up very well. The way that Citroen have used the bold Citroen inverted V logo on the front end gives it a really distinctive look, no mistaking it for some anonymous far-eastern product. Must admit we are Citroen fans and have 2CV, Dyanes, AX, ZX and C3s, all have given pretty good satisfaction, if not entirely trouble free service.