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Jim in Ohio

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  • Lexus Model
    2006 RX400h

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  1. I have used regular 87 Octane in my 2006 RX400h for two years. for the last 12 months my MPG average is 27.6 (I do not reset so that I can see winter/summer averages over time, but the dealer reset it about a year ago). Using 87 octane I usually do about 8% better in the summer than in the winter for mileage. I tried higher octane for several tanks across the same weekly driving habits and did not get any improvement worth the extra $.20 per gallon. The manual says minimum 87 octane or higher so I am comfortable that there is no extra engine wear due to knock. I have good driving habits. My '99 RX300 averaged 21.0 MPG. I am enjoying the gas savings.
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