John you got it! Bobcat tried it in 05, and made I think 19 hours, he lost the right front wheel when he had a hub failure (Very common on those first gen Rx7's) and it took too long to get towed in and the problem fixed; his body went into shock from the cold. As a former first gen rx7 pilot, I can tell you doing that 19 hours was harder than all 25 in a Miata... that is not to slight Steve (or DDG) in anyway.
Donnie Edwards tried it this year also in a spec E30.
Marcus