The Full fat models are group 16 insurance, the cup's are group 17.
MPG wise, on the motorway it will do 40-43mpg at a steady 80 ish, can get it towards 50mpg if your willing cruise around at 50-60mph
Around town its in the low 30's, 32-34 ish for me as a guide,
On the track around 20ish, although i guess this totally depends on your driving style.