I've had my C5 Estate for a couple of months now (6000 miles on the clock) and I'm quite happy with it apart from the fuel consumption. I get around 45-46mpg if I drive it very carefully on A roads at about 70mph, with little town driving, and if I drive at about 80mph on the motorway I only get around 40-41mpg. This compares to some VW and Merc drivers that drive the same route that get about 50-53 on the motorway and we all drive at around the same speed. All my previous cars I've been able to get the EU combined figure or better, so it seems a bit odd that I can't get anywhere near the 50 for the C5. Has anyone else had similar mpg, or is this something to ask the dealer to look at ?