I'm monitoring my fuel consumption following the road tune. It seems quite reasonalble concidering the changes I have made. Its hard to measure properly, because the Mrs trips are not long, but I'll have a crack.
Staqg250 - your Rank is based upon your post count. You start as a RB20e then progress ir RB20de, det, RB25de, det etc etc up to RB26dett with something like 10,000 posts.
A few of us smart cookies just changed it to something more suitable for M35 owners....