New X5 Owner: Thoughts & Questions

[Villnave]

Last week I took home my new X5 30i... Black Sapphire Metallic, Black Leatherette, Dark Bamboo, Tech package, heated seats, rear climate package, running boards, sirius.. very happy with the purchase and coming from previous vehicles (trucks, suv's, minivan), this thing is incredible and I'm loving it. I've been a long time reader of this forum, and was actually concerned that maybe I'd be irritated about some stuff in the car (notably, the slow iDrive response), but so far it actually seems pretty snappy and I haven't noticed it being slow or unresponsive. The thing only took 3 weeks to arrive after being ordered, so overall the experience was great.

Quick question regarding fuel....

I know the recommended fuel is 91 minimum, and I live between a Sunoco that has 91, and an indian reservation that has 93 pennies cheaper than Sunoco's 91. Is there a reason I'd be better off using the 93? Also, I do not know anything about the source of the reservation's gas and if high quality gas is something the X5 wants, should I maybe steer clear of it? Is there any performance/mileage gains to be had with 93?

I'm not much of a car guy... I drive them, but do not work on them, so I'm looking for some expertise from someone who knows more than me.

Love the car so far.