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      01-11-2013, 02:10 PM   #32
Boulder Bill
First Lieutenant

Drives: 2013 550i/6 speed M-Sport
Join Date: Aug 2012
Location: Colorado

iTrader: (0)

Fascinating. Really. You sound as close to a rocket scientist as we are likely to see on this forum.

I have always run premium and will continue to do so. My sense was essentially what you have stated - I wanted to protect the engine from unecessary wear and the marginal cost was insignificant.

Going back to the OP, if you have the car for 3 years and then turn it in, perhaps you just don't care. I wouldn't know, since I buy, hold and drive. I suppose those on a lease have their decision to make. But thanks for the thoughtful post.
2013 F10 550i | 6 Speed Manual | M Sport Package | Carbon Black | Oyster & Black Nappa | Dynamic Handling w/Dynamic Damper Control | Executive Package (Comfort Access - Soft Close - HUD) | B&O Sound | Luxury Seating & Heated Seats
(retired: 2002 E39 540i | 6 Speed Manual)