avc8130 said:
It's all in how hard you ride the bike.
And pavement. Pavement is mostly local gravels which vary tremendously in abrasiveness. Some of the grippiest pavement in the country is areas of the west where the pavements are made from volcanic gravels but they're absolute hell on tires.
And tire pressures. A lot of folks think the book pressures are too high and run lower. Some run over book. At high speeds, 44 psi vs. 38 psi can double rear tire life.
And loads. A stock, unaccessorized bike ridden solo can see double the mileage of a fully-farkled and loaded bike ridden two-up.
Lots and lots of reasons why tire mileage is all over the map. It's a wonder there is any consistency at all. My take is that there is a lot less variation in tire mileage between brands/models than most think. Put all the 90-10 tires on the same bike and ride them exactly the same way on the same roads and I bet the variation is +/- 20%, not the 2x, 3x, and more variation that we actually see.
- Mark