Quote:
Originally Posted by airbiteses
Only above 30 degrees outside, the use of 98Pb reduced fuel consumption by an average of 0.5 liters less.
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It actually makes sense. When the temperature is higher, there is more latent vaporization heat in the air, so either a higher volume of lower-grade fuel or an improvement to the octane rating are desirable for knock mitigation during the compression stroke. Did you already notice any decrease to fuel consumption while driving somewhere with a higher amount of moisture in the air? It has a similar effect to switching from a lower octane rating to a higher one.