Cold hurts tire warm up, wasted fuel warming the engine, cold drive line, and worse that I only drive it ~4 miles 8-12 times per week. Except special occasions, like interviews and holidays. That's why I won't have a good idea until summer.
BUT, why take it off for autocross? As long as it is stable, I don't really see the reasoning. Not arguing it will make a noticeable difference, but doubting it will hurt any, it seems like a lot of work to break even or do microscopically worse.
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