I have a 2000 megane petrol... this morning, my milometer said 45.3 and had a picture of a lolly pop (?) then 3 dots then a car... this afternoon, i had a number displayed, which counted up, and down, i noticed it go between 430 and 477, next to this was a picture of a car and an arrow pointing towards a petrol pump. I have a full tank and the petrol light isnt on!! help!!!