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If the Commander is rated for 87 octane, anything more will not make a difference. You see, on EFI machines the fuel map is set in the ECU and will not recognize or benefit from using a higher octane. Now if you get a programmer you can set a new octane rating and that will give you a couple of extra ponies. People do the same thing with cars all the time. The car is rated for 87 but they buy 91, and their wasting their money. Some think they will do it anyway because they think it is a cleaner fuel, and that's not true either. Now if your engine is rated for 91 and you use a lower rated fuel, that is definitely bad for an engine and you will get a ping. You guys can google it too, there's a ton of info on it. I don't know what the Commander's rating will be but I know the Outlander is rated for 87, which makes me think the Commander will be too.
 

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fuel

Octane in side north americia 87(R+M)/2 or higher
outside of north america 92 RON or higher these are the minimums acording to the OM.
 

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