We just ran BFG Rivals on our Skyhawk at a 24 Hours of Lemons race and they performed beautifully. The pavement was about 140-150 degrees and the air temp was over 110 and they never felt "greasy" and lasted all 16 hours with enough tread left over for at least another 8 hour race day. Not sure how that equates to AutoX, but I can say they felt great whether just starting out of the pits, or an hour into a race stint.
Oh, they're 225-45 R15 mounted on 15x7 Z28 rims. They're also Made in U.S.A. if that matters to you.