@FunCycle has claimed increase... Not sure who else...
With the CAI and the cat delete I increased 4 mpg, this is with the pencil and a couple of 1,500 trip mile averages 34mpg. Then I did Bob's tune and the Welter Dual install at the same time in Maggie and dropped 4 mpg on the 1,500 mile trip average down to 30 mpg. Everyone else was getting about a 4 mpg increase with Bob's tune, even Bob does not know what is going on. The only think that we can figure is it has something to do with the exhaust.