The petrol used bit on the built in computer is Sh*t, It has never been accurate from the start.
When I fist got my clio 1.2 16v I could easily get 50-60mpg from the first half of the tank by driving granny style, now four months old and 10 000 miles in Im lucky to get 40.... dodgy I know,
Oh well goes back to renault on Wednesday for the third time, this time for the airbag wiring patch and to have new seat handles fitted as one is stupidly stiff and the other snapped due to being stupidly stiff!!!