kind of embarrassed to ask this...
 

but the gas jockeys put in regular instead of premium...
i've never had a superbeast so i don't know from experience, but is this really bad or should i dilute with premium at half tank..

I remember this happening to one of the other members on the board, but you should be alright. if it does make you feel better to dilute at half gallon than by all means go ahead, the problem will only come from constantly putting lower octane gas in the vehicle causing engine problems. just don't lose too much sleep over it!

I would dilute although you should be ok. Turbos don't like regular gas, avoid stepping on it while you are running this tank out

^ Yeah, you will be fine. I personally wouldn't drive the piss out of it just to be safe though, but don't lose sleep.

thanks...i've never really had this high performance of an engine before and the manual is pretty vague so i figured you guys are the best to ask :)

Don't worry about it. Drive it till the fuel is gone. Fill up with the fuel you want, Done

I would take it easy until it is gone, and then put premium in it next time.

The electronics will retard the timing to compensate for the lower octane but you risk going into limp mode and throwing codes if it gets really bad.

Put in a small bottle of Octane boost! You can get them at just about any gas station. Fill up the gas and that should stirr it up in the tank and you're good to go!

Regular vs Premium. Been discussed over and over.
One tank full won't harm anything... Just drive.

http://www.xoutpost.com/bmw-sav-foru...69876-gas.html

I would call roadside assistance and have them bring the car back to dealer. Drain tank and start over. :nanana: Just kidding. You're fine. Like others have said. Go light on the pedal and fill it up with premium as you go. No issue