Got me thinking as to why our Hemi ran better at 37 degrees, maybe the old Sonoco 260 and first out racing gas was a slow burning fuel. RPM=slow burn=more timing. I remember after using Cam II purple it would evaporate out of the cell one week to the next, switched to blue and it never evaporated. As to the OP, I can't see using 93 and not pinging with a true 11.5 unless very little max timing, I'll find out soon since I'm putting together a iron head Hemi 485 cube with 12.5 (down .055" shorter deck height piston, long story) so I'm all ears guys.