91 vs 94 shouldn't make any difference. Two things could make a difference, though:

1) I assume you purchased the 94 octane in BC, likely the Lower Mainland/Greater Vancouver. If so, the fuel is often higher quality than locations south of the border.

2) If you normally drive in the city, and you got some highway miles in coming up the I5, the vehicle may perform better due to having burned out deposits that build up over time.

Apart from that, you may just be on a natural high from the skiing/boarding

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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