I watch this thread with great interest. I have a 990 with Leo Vs and it runs well but sucks fuel. Just a note to Cyborg about his theories. I had a Trumpy 990 i Tiger and it ran like a wheelbarrow. I fitted a Powercommander and loved it, especially the pumper carb feature. Made the bike powercurve flat and nice and pulled wheelies at will. It did use more fuel though. Interestingly, part of fitting a PCIII to this bike is to bypass the O2 sensor in the header. I did a bit of research and found that Triumph fit the "cheap" lambda sensors that are termed 2 wire. There appear to be dodgy with a stated accuracy of +/- 10%. There are better sensors made by Bosch and others that are 3 wire and heat themselves up and get better accuracy. Maybe KTM use low rent O2 sensors and this inaccuracy / variation could be the cause of the wildly different fuel uses on otherwise identical bikes. Anybody know?