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JRB

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  1. When we took delivery our dealer recommended using the mid-grade octane, which in our area is either 90 or 01, depending on which brand/station you go with. You will not harm the vehicle by using 87, as the engine management system will automatically adjust the timing to prevent pinging. In return, you will experience some loss of performance. But on flat roads and with mild acceleration, you would probably not ever notice the difference. I personally plan to follow the recommendation in the owner's manual and use mid-grade (90 or 91) fuel. Although admittedly in these days of very high gasoline prices it is tempting to buy whatever is cheapest, over the long run the cost differential isn't significant. And I figure that when it comes to maintenance it's best to follow the manufacturer's recommendations. In these days of sky-high fuel prices, being able to advertise that only regular grade fuel is required is considered to be an advantage, and Lexus would probably be touting this if the engine had in fact been engineered to run efficiently on 87. Just my 2 cents - your mileage may vary.
  2. In a different forum it was said that the owner's manual is in error and there is no way to eliminate the beeps by using C-Best. You can apparently change the number of beeps for the rear door but two beeps is the minimum.
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