you should double check your manual because I had a 2003 ram 2500 with the hemi and it did recommend 91 or above for fuel. I did some research back then and found that very few engines these days do need high octane fuel. The hemi falls into that category because it has high compression. I always ran mine on on 91 or above and never had any engine issues.........rust, however was a different story.
2016 Diesel Ram 3500 Mason Dump 1971 Challenger 2013 Jeep Wrangler 1979 Dodge Ram Power Wagon 400 Mini Pumper My other car is a Fire Truck.