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My Acura says something similar, saying 91 PON is recommended, and anything below 87 PON may cause engine damage.
I've been running 87 PON for years with no adverse affects other than reduced top-end power. The timing is slightly retarded, which may reduce fuel economy ever so slightly, but I don't notice a difference from my fuel logs. I can tell the difference between 87 and 92 PON just by driving the car. My wife used to randomly choose one or the other, and when I went to drive I would correctly identify which grade she choose based on acceleration feel.
Sometimes I'll mix my own, filling about half with 92 PON and then filling the rest with 87 PON. Mid-grade fuel here (89 PON) is simply a mixture of 40% premium and 60% regular, which they charge more for than mixing it yourself.
All this to say, run the cheaper stuff and see if it impacts fuel economy in any noticeable way.
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