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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
you can just load the 91 but be sure you have 91 or better octane gas in the tank before you do.
Good words. Up here in northern Utah, we are over 4700 feet in elevation, and the min grade is 85 octane. (Engine octane requirements decrease with altitude, I'm told) However, when I loaded the 87 tune, I could hear the engine knocking when going uphill. Had to fill up with 88 (mid grade here). So, make sure the grade matches your tune....