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The 2009 Acura MDX suggests using premium unleaded gasoline with an octane rating of 91 or higher. While some drivers have used 87 or 89 octane fuel without issue, it's not the best choice. The engine was designed for 91 octane, so using lower octane fuel can cause engine knock and potentially costly problems later on. It's worth spending a bit more on higher octane fuel to avoid these risks. Lower octane fuel also has a lower flash point, which can lead to premature combustion in the MDX's engine. While using lower octane fuel occasionally may not cause immediate harm, it's best not to make it a habit.
Acura suggests using 91 octane Premium fuel for the 2009 MDX, but you can also opt for 87 octane Regular unleaded fuel if needed.