Not understanding the Dooper's miles until I need diesel
I bought an 07 Diesel on friday and today has been the first time ive given it a decent run out. I put in £35 of Diesel today and it showed up that I had 360 miles until empty. I drove 50 miles sensibly on the motorway and noticed I still had 330 miles so from then I decided to keep an eye on it. I then noticed it had gone from 330 miles left to 340 miles. After 80 miles its ended up at 326 miles left so although ive done all them miles my indicator has worked out that ive only used 34 miles.
Does the diesel left on the computer sometimes rise like that? Im not complaining or anything but seems strange ive driven 80 miles but only used 34 miles in diesel.