Thanks guys for the quick response,Tony...you know i have noticed that my tank did appear to be sucked in a little...i have never had that happen to me before,i kind of just shrugged it off...but my vent line is clear..maybe a little long,but is clear...Rich...i am going to pull off the cowling sometime this week and check all the bolts for any loosness and leaks,a friend of mine said his 200 had leaks around the case to cylinders,not to mention a couple of cranks shearing...got rid of the engine and went w/ DA and a 40% plane.See...another friend of mine is having the same problems...same engine,from what i am hearing this is not uncommon w/ the new series AI is putting out...Anybody else have some ideas???i have also noticed that after landing i have hardly any oil residue...if none at all...i am mixing at AI recomendations and using Lawn Boy oil...i have tried 2.56 to 1 and also 3.0 to 1....still with hardly any oil residue..What do think?