switched to 89 octane for my 2004 dodge RAM 2500

spadoctor wrote:
sounds like a poor design to me. No excuse to design any motor to need more than 87 these days....just look at Ford and Hyundai vehicles

Not at all and here is the main reason...today's computer controlled
everything has the computer sense higher octane fuel, so it can and
will advance the ignition

That will then have more power developed

If poor octane fuel, then the computer will sense knocking and phase
back or reduce advance. That will be less power