sofar i have deristricted my cdi performance variater 6gram roller weights derestricted variator and it will do 42 on flat ground
..when I bought my '08 A50 new, the dealer said it would run 42 derestricted...
..now, I installed a Malossi multivar variator with 5.5 gr rollers, along with the longer main clutch spring that came with it..
..drilled my main jet to an 85, from the stock 80..
..keep my valves adjusted to .04mm ..
..keep my tire pressures at spec..
..run highest octane fuel I can get...
..I generally run between 42 and 47 on "flat ground", GPS verified, cause you cant go by your speedo...
..I have, under ideal down-hill conditions, pegged my speedometer..