Just done some quick workings out.
Don't know how accurate the fuel gauge is, but I tend to have about a helf or just less left for between 190-210 miles all in.
The tank is 67 litres, and supposedly a 400 miles range. Just done some working out, and that makes around 27mpg the expected average for a T16S. So I'm actually up on the balance of things, as I do tend to find "target" cars on the local dual carriageway in the last 4 mile stretch from home, usually because they are the ones who will drop to 40mph when the dual carriageway NSL turns to single carriage NSL.
Had fun with a RX8 Friday going home. Side by side on the roundabout, he boots it, I boot it, he cuts in front so I have to back off, he floors it again, so I do the same. Every gear change he would start to gain a bit, then my turbo would spool and he got reeled in. Then at 70 in third, about to change up, we both got slowed up by two middle aged women in a CLK230 with the top down, enjoying the sun in the second lane of a dual carriageway at 40. By the time they realised we were there, we were close to the next rounabout so when they pulled over there wasn't much point in playing again. Still averaged 29.5.
However, I did do a 200 mile return run to angelsey the Friday before, commonly know as a Swedish tuneup (yeah I know Brunstroms so kept to the limit on his side of the border), and for the next month that tends to improve figures.