Quote:
Originally Posted by wrh3
Good luck in your debate 
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Just say "Dad, my car, my rules". He should respect that....
Mine has had 87 in it twice. Very first full tank (done by dealer, without me realizing) and during the Colonial Pipeline induced fuel shortage. So far she hasn't turned wheels up in the morning.
As @
Tcoat said, just don't do it regularly and if it does happen just dilute it (strengthen it?) by filling the tank at half full the next couple of trips.