Az (native from socal)
Had 87,89(never used), and 91
87 in the cars
91 in everything else
Now in Idaho (4000ft) they have
85
87
Clean 87 ethanol free
91
I still run 91 in all the toys but can i go down to 85 in the 2014 acadia v6 and/or the 2021 silverado 5.3 v8
Input? Tia