I used 89 on my 2010 and 2014 1500s for short periods, especially when towing. I wish I could say that conclusively I realized any difference at all, but I can't. My current 2019 has never had anything over 87 in its tank and runs fine with no issues. Nowadays it's hard to justify the 50 to 70 cents more a gallon for 89.
Regards,
Dusty
2019 Ram 1500 Billet Silver Laramie Quad Cab 2WD, 5.7 Hemi, 8HP75, 3.21 axle, 33-gallon fuel tank, factory dual exhaust, 18” wheels. Build Date: 3 June 2018. Now at 95790 miles.