On regular (87), yes.
On mid-grade (89), no, not with respect to power or fuel economy.

Here we pay 6% more for mid grade, an additional 6% for premium. I choose to save the 6%, not for the monetary value, but on the principle that I don't like waste. If I could detect or measure any difference using mid-grade vs premium, I would use premium.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue

This is quite common, my understanding is, it is to cut back on credit fraud at the pump. I have noticed almost all 76 gas stations have this auto shut off and so do other stations.

-- One of the gas stations by me is privately owned but a 76 franchise. I like the owners, they are nice guys, but I won't buy gas from them.
Most of the time I am rushing when I have to fill up and don't have time to go in and be bothered with the "here's my cc, lets fill er up"
So the local gas stations that have the $50 shut off are losing my business.

I mentioned it to the guys at the local gas hole but they said it's a corporate thing.. Too bad, I would rather give them my business but not at a constant inconvience.

B

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"When two people agree on everything, one of them is not necessary" - Arliss