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      01-09-2013, 11:55 AM   #10
Boulder Bill
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Drives: 2018 Porsche Cayman GTS
Join Date: Aug 2012
Location: Colorado

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LOL. I agree I guess. If there was ANY difference in performance noted, why wouldn't you buy the premium fuel.

I don't want to launch a huge debate, but over the 10 years I owned my E39 540, I periodically used low premium gas - either by accident, availablility, or spouse. I never noticed any difference. This isn't to say that over time there wouldn't be or that the engine might not be harmed in some minute fashion. But I couldn't detect any decrease in performance.

I use the high octane gas in an abundance of caution. I don't feel very pound wise or foolish doing so. But I doubt very much that after 36 months, someone leasing a car has harmed the vehicle in any significant fashion for the next guy. I guess I just don't know.

But I love the consumer behavior study reference.
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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)
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