If I remember correctly Chevron has a 94 octane rated fuel, If you use Save On Foods etc you can get points on it as well. I have also read the great debates on the different fuels, Best rule of thumb is if BMW does not recommend it for their vehicle-don't use it. They have the engineer's that design them, not always perfectly.
But they usually know what works best in their vehicles. Have you talked to BMW regarding this?
