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Old 11-04-2009, 04:23 PM
erm
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I've noticed the same thing on several vehicles over the years and I believe it's the change from summer to winter blends. Additional ethanol mixes basically reduce the number of gallons you can put in your tank (volume per gallon increases with the winter blend) plus the blend is a bit leaner, reducing optimal combustion.

When the summer blends come back in to supply, you should see an improvement.

I know for a fact that Chevron does different blends for certain times of the year.
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