I find this really odd, but when im cruising along the motorway at 70mph (or whatever) my range seems to keep coming down.

Then when I start to give it a little stick through the gears the range seems to go up.

I find this really weird, I thought it would be the other way round.

Generally though, the MPG isnt too bad.

I do a 15 miles commute to work (one-way) driving through rush hour traffic, then 30mph, 40mph and 50mph zones, then a final put your foot down 4 miles stretch and im averaging about 42mpg.

Its a 2.0 DTI on an 05 ..... that dont sound too bad does it?