Gain .6 MPG on this test with 93 vs 87. (Along other the other various items)
So you get 633 per tank at 93 vs 612 with 87.
With my local price, $33 a tank per savings going with 87 over 93. Add the 1.3 gallons the 93 does in savings, and it would be $27.75 per tank. Lifetime savings of $14,430 (tank a week for 10 years). YMMV, but it’s all how you calculate and what you want. You can run a min 87 and it’s not exactly a high performance engine, otherwise they wouldn’t give you the option. The recommended however per the manual is 91+ Especially for hot weather or trailering.