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My wife ran her Murano on regular for 32k miles. Premium recommended.
It would rattle backing up our 10% grade driveway, but other than that it ran fine.
Test the different grades to see what happens to your mileage, if you hear knocking consistently then you should not use that grade fuel.
Sometimes the difference in mileage will offset the difference in price, when the engine was designed for higher octane fuel (emphasis sometimes).
I would use the highest gear and lowest throttle position that gets you to the speed you need to merge safely. Since your Acura probably revs 3k at 60 MPH I would try 4th or 5th gear first. Avoid WOT because your consumption will rise dramatically.
When you get the vacuum gauge installed try it at 2 inches without and more than 80% throttle position.
regards
Mech
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