Gday one and all, I am running a td5 d2 with 3.9 GBR gears and 235/85/16s. Rpm at 100kph is 2250, which is same as 3.9 on std tyres. I have done just on 100k on these and find them to be spot on. Engine has a davis chip in it and no egr or center muffler. I find the biggest advantage when in low range as it holds down hills much better than when it had std gearing and 32" tyres. I'm averaging about 11 lt per 100ks, car has bbar winch, rear locker,2 inch lift also, hope this helps. Cheers Ben.