Gas mileage Issue


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Here's the skinny: Went to Alabama Christmas day, got about 17.5MPG. Came back this past Mon, and got from 14.3 to 16. Same road, same everything. Truck is a 2010 Silverado 4x4 with the 5.3, 6sp tranny, and 3.08 gears. Some of the gas was ethanol based, same as on the trip out. Last tank was real gas. Don't think there was much of a difference. Any ideas?

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Some of the gas was ethanol based, same as on the trip out. Last tank was real gas. Don't think there was much of a difference. Any ideas?

Have noticed with our durango that the mpg's according to the computer may vary as much as 3 mpg with daily driving driving the same route the same way with very little variance. I believe the gas we are using and what is being distributed to the stations might have something to do with it.

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the only other thing I can think of, were you driving into a head-wind on the way home? I'm onboard with the fuel being blended, that causes poor mileage...was getting 17.2 all summer/fall....then comes Dec. and 17...I drive easy and it will not come back up for nothing..and otheer than the last fews days being near zero... we have had warm temps too

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