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91 octane

  1. Higher gas mileage on 91 oct gas

    Fuel Economy and Gas Related Discussion
    I drive about 300 miles per week, mostly rural coastal Texas roads at 60-70mph with some city driving. My 08 RTL has about 130K miles. I use lowest octane for normal driving and 91 when pulling our travel trailer. I have consistently gotten high 16s low 17s mpg in normal driving. We were...
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