I'd love to know which new big block naturally aspirated American cars don't recommend premium fuel. I think the low octane fuel is really only there for the older cars (and for folks who don't understand octane ratings).

Recommendations only do so much, 80% of sales are crap fuel.

https://www.energy.gov/eere/vehicles/articles/fotw-1270-dece...

Modern engines will pull back timing and decrease efficiency to prevent breaking down, raising the bar is in everyone's best interest, except the fat and happy Oil companies.