Gas issue

you car is smart,but not smart enough to know the difference in the octane of the 8 gallons of unleaded 87 octane fuel.some folks run 87 in the same vehicle and have no problems.some switch back and forth.just fill it back up with 91 or 93 or whatever you've been running in it.no need to take it to the dealer,unless you want to pay them a lot of money for whatever reason they tell you,and they will convince you that the engine will blow or lock up,but it will not!