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Originally Posted by Chance
Just for the fun of it, I did a little reverse engineering to see what the difference in speed would do if you slowed to 60 MPH (80% of 75 MPH), making some reasonable educated assumptions, and it turns out that slowing from a steady 75 to 60 MPH could bump your fuel economy to around 12 MPG -- provided engine efficiency remained the same. Unfortunately it won't because the V10 is too large to be efficient in an Axis creeping along at a steady 60 MPH.
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There are other Axis/Vegas owners reporting more reasonable 9.5+ mpg values (not in this thread, however). My guess has been that they are also driving more reasonable speeds as well (60-65 mph).
My F-350 by itself would rarely go over 11 mpg (also driving 75 mph) which had the 3V V-10 (the same as in the F-53 chassis I believe) and was a little less brick like than the Axis.
What kind of mileage do you get in your van?
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