Well, the Zippy 1 research is in!
My findings indicate that a man-sized rider (6'3" and 265 Lbs) riding flat out most of the time; with a constant tire pressure of 30 psi front and 30-32 psi rear can expect to get 3300-3500 miles on the Zippy 1 tire from Continental.
My OEM tire was replaced at 2223 miles. At 5465 miles I now have a wear bar showing but could still probably get a couple hundred more miles out of the rear tire. The front one is doing fine. I may be able to double the mileage with it as there is no significant wear on it.
I just bought a new rear Zippy 1 for $44 from Scooterworks in Chicago. Shipping was like 9 bucks. I'm happy with the tire. It has performed extremely well in the rain, too.
