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i have Toyota Surf 3.0 L . i need to visit the places which are plus 4000 meters (15000 feet). do i need to use low octane fuel or do i need to increase the intake of fuel due to high altitude and less oxygen. please explain in detail.

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Carry on using your regular fuel. The BARO in your engines ECU will adjust for altitude, and O2 sensors and MAP will keep the engine running sweetly. You may notice a small drop off in power but it will not be enough to be unduly concerned.

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