You can use either octane range of 87 to 89. But Daimler-Chrysler recommends to use 89 octane for optimum performance.
my opinion-if it is designed for 87 use 89.
Depends on what type engine. the 2.7 L and 3.5 L are made for 87 octane fuel but can use 89 and 91. The 5.7 L can take 87 octane or 89 octane but i would use 89 for it. if i had the 6.1 hemi i would use the 91 octane cause it is a more consistent fuel.
Try 87 Octane if engien does not "ping" excessively you should be OK If engine "pings" try 89 Octane
The 2000 model, Mercury 25 hp outboard, requires a minimum octane 89 rated, unleaded fuel, however, with the quality of gasoline being what is presently, it would not hurt to run the higher octane fuels.
you should use the medium rating octane(may vary depending on station)but usually 89 octane
87 Octane providing that it does not "ping" excessively - if it does use an 89 Octane
89 OCTANE
I would not use anything less than 89 Octane
65% of 87 and 35% 93 to make 89 octane gas
You need 91 Octane, which you can use 93 octane and 89 octane mix. which is Premium and Mid grade fuel.
Other threads on here have shown that you can run on a lower octane. I have owned 2 MDXs and run mid-grade (89) in both with no issues.