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Wheatley, Arkansas | I'd be inclined to believe .2-.4, but +2 kinda gets out there. Documenting a 33% increase (6 MPG to 8 MPG) due solely to tires is unbelievable. I guess several hundred miles vs 125,000 miles could make a more dramatic swing in MPG.
From a news article:Interstate tests by ORNL’s National Transportation Research Center show gas mileage increased nearly 3% with use of wider single tires on tractor-trailers. Bill Knee, who headed the study, said the change also allows widening of the trailer frame by six inches, providing a much more stable configuration.
We noticed that there was about a 2.9% fuel saving in using the new generation single wide tires over the standard dual tires. These trucks do 125,000 miles per year on the average. They currently get five miles per gallon. You can see there is a considerable amount of savings dollar-wise that can be realized through tires like this.
—Bill Knee
With those figures, a 3% improvement in fuel economy would reduce fuel consumption by about 728 gallons per year per truck.
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Super singles vs duals
