93 is a must. Cali guys who run 91 don't make the power other states due. The knock-sensor does it's job, and there's a HUGE difference between knock events on 91 and 93. It has to pull timing to keep up with the knock and it's noticeable on the butt dyno.

There was a guy a few motnhs ago with a DashHawk that did a lot of datalogging with different fuels and posted printouts of the knock-sensor readings. The 91 was horrible on the timing cure.

Ben, I hear what you're saying about the Xede. Guys w/MS6's have done it on stock vehicles like the MS3 that BEGi did, and see 30whp due to AWD driveline loss. More mods see more WHP of course, but there's still boost and fuel cut that plagues every piggy that's made it onto the MZR engine.