Do I need to put 91 Octane or above in my 2009 Acura MDX?

[pete]

The dealer said I do, but can I get away at least with 89 Octane?

[JetDoc]

There are very few automobiles sold in the USA today that actually require premium grade gasoline. Unfortunately, your's is one of them. The MDX engine has a 11.2:1 compression ratio that needs the higher octane fuel to run properly.

[cbrdgt.]

This is what my Acura dealer said last year when I bought my '09 MDX sport, "You paid for 300 horses, so if you want to experience that, use premium." They said you *could* put regular in, but you'll see a decrease in power and MPG. Use premium...It's only a couple bucks more per fill up.

JetDoc - The '09 MDX engine is actually a little different than what you linked to. The '09 has a compression ratio of 11.0:1, which most definitely needs premium still. They tweaked the engine for the 2010MY
http://www.acura.com/Engine.aspx?model=MDX&modelYear=2009

[SULLY]

As in any very expensive luxury car, only use the highest octane possible. And never buy gas from something like 'Pop's Gas' Should you not, you are going to build up so much sludge on your valves it'll run like a Smart Car!!