I have just bought a C3 HDi Deisel 90hp. The advertised fuel consumptions
are 65mpg combined and 53mpg urban. The computer is reporting a consumption
of 52mpg with urban usage. The actual consumption calculated manually us
My last car was a Picasso 1.6i Petrol which was also fitted with fuel
consumption computer. The reported consumption was always better than the
combined advertised figure of 37mpg usually around 39-40. If driven
carefully it could improve to 44mpg. I must admit I never calculated the
Why is there a shortfall on the C3 where as the Picasso was better than the
Is the computer system just inherently inaccurate?
Could it be down to the way diesel and petrol engines?