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48 comments on Recent VMT and Fuel Economy Trends

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odograph on June 12, 2006 - 8:14am

In the Prius forums I hear a number of people saying that "winter gaslone blends" keep their mileage down during that season. I wonder how oil industry types respond to that ...

(In California I haven't noticed a lot of seasonal variation.)

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Bryant on June 12, 2006 - 2:30pm

Indeed. My diesel also gets about 10% fewer miles to the gallon during the winter; from 24-25 mpg during the summer to 22-23mpg during the winter.

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Robert Rapier on June 12, 2006 - 8:18pm

In the Prius forums I hear a number of people saying that "winter gaslone blends" keep their mileage down during that season. I wonder how oil industry types respond to that ...

Formulations do change in the winter. The most significant change is that the butane in the gasoline pool increases from about 2% to about 10%. I suppose this could affect fuel efficiency.

RR

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