A full tank would average me 300 to 350 miles mixed motorway and round town driving, and a good long motorway run (Huddersfield to Hull, ferry, then Rotterdam to the'Ring - 350 miles) and I had 1/4 tank left over, so that full tank would of seen a good 400 miles easily
that was stage 3, T34, dark greens, 27psi spike, 23 held, closed loop, coilpack etc etc