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When most people drive their Prius, they tend to stick to the basics of “D” and “P” on their shifter, but what is the “B” mode used for? The “B” on a Prius shifter stands for “braking.” This feature activates engine braking, which uses the car’s engine power to slow down the vehicle instead of …

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Fuel octane is a measure of a fuel’s ability to resist “knocking,” which is when the air-fuel mixture in an engine detonates prematurely. It’s expressed as a number, such as 87 or 91, and the higher the number, the more resistant the fuel is to knocking.  Knocking is a problem that can occur when the …

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