Hi Joseph,
For what it's worth, I think the heat cycles get to them in auto-x also but it takes longer. 12 events is pretty good longevity for AS03's judging by what others say where I'm at.
We run Hoosier/Goodyear slicks in the softest compound at auto-x's and we get usually 5 events out of them with a 2 driver car. We usually have 8 runs each so that is 16 per day X 5 days = 80 runs. The auto-x compounds like an AS03 are softer than the road race slicks and go away quicker as they are made to get up to operating temperature on an auto-x course.
We run the slicks for cost savings as much as anything else. We're running more track events, so we use them for 8 heat cycles at the track then retire them to auto-x and wear 'em out!
Personally, before we put the 6 in the 914 we ran the Victoracers in the 205/50/15 size on the stock bodied car and they really lasted a long time, much longer than the AS03's or the slicks. For auto-x I think they are a very budgetary way to go. The only downside for the Victoracers I see is that while the Hoosiers seem to go away in a linear fashion, I was at Thunderhill when the V-Racers decided they were done and you can feel the drop-off in performance each turn in a lap. For me, as they went away, they went away fast and felt very greasy.
Just my limited experience.
Bill P.