Brazil on this occasion. I'm struggling to find a way to effectively gloss the tires in MR to give similar reflections that I have now. However, I'm using Brazil lights (no GI) and the render time has been cut by roughly 8 minutes @ 960x768, the one I did an hour or so ago took 18 mins (my PC sucks, on a high end PC, this would be 3-5 mins I think), for MR, it would probably be the same, it's a stupidly complex rendering system, but I have to admit, it is better than Brazil for some things I think.