I may be going out on a limb, but I feel the car runs better with this E25 blend in 90 degree weather than in 70 degree weather w/ 93 octane. I can drop it into 3rd gear @ 50mph, go WOT, and the car feels like it's riding the proper ignition curve vs. having a flat feeling (ignition retard) when accelerating at WOT.
I'll snag the BT tool tonight to log ignition timing & fuel trim(s) to see if I need to adjust the blend.
E90 LCI M3 7-DCT Interlagos Blue/Novillo Silver
[MS Pullies|K&N drop-in|Test Pipes |Evolve Stage II tune|Evolve Servotronic Map|Evolve M3 GTS-DCT file]