Well, I'm back from vacation. We decided to take the scooters out for a long ride to give them some exercise. When we were on our way home after going about 60 miles, we stopped at a light and my scooter was idling really rough. I looked at the tac and it was hardly registering. I was down to close to 1/4 of a tank so we filled up at a local station. When I started it after the fill up it idled perfectly. I know that the dealer had charged me to get all of the old gas out and I have filled this tank multiple times since I bought it, so this puzzles me. Any suggestions, Scootereno? If it is the idle adjustment it would have always been rough, wouldn't it, not just when the fuel gets low? I am pretty sure that it has something to do with all the old fluids that sat in it for 6 years, but the dealer assured me that they had changed out all of that and run fuel stabilizer through it.