What grade of gas to use on my 2001 Dodge Ram 1500 V8 Magnum

Not necessaurly. Octane will have little effect on how wellit starts. The biggest difference will be acceleration and gas mileage. Vehicles designed to Rubin higher octane could knock when accelerated hard or under load and the knock sensor will retard timing for which will cause decreased acceleration and worse gas mileage. If the knock sensor ever fails and there’s severe engine knock then you run the risk of destroying the engine.