does anyone run reg. gas? is it a problem if you do? i a wondering if it would make a difference in gas milage.

My dealer recommended regular fuel for my 2008 RX350. It runs great and gets better gas mileage than my 99 Mercedes ML 320 did. No problems at all.

The higher the compression ratio, the more octane molecules are needed in the gas (as you know 89 octane has less then 93 octane). Some cars that have high compression ratios need more octane because octane will not spontaneously combust like hexane, etc when compressed.
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