Not sure I understand? Premium gas will also contain alcohol (unless you specifically get a gas that is advertised as zero alcohol, but that's not available at most gas stations).
Not 100% sure about this, but worth a try... just adjust the volume on your phone while using the assistant. That should work, and is probably easiest.
I would call and ask the cost at the indie mechanic. You might find it's not much cheaper than the dealer (mine does all the things you want as a matter of course, incl an inspection video).
Of course, if you don't like or trust your dealer, then ignore this :)
Well, in an (admittedly small sample) case of my cars, the one in our 2014 CX-5 broke, folded the wheel, and popped the drive shaft CV joint. Fortunately for us, it happened while moving the car in our driveway. (See the thread I linked above.)