AutoExpress looks at MPG myths, little impact from tire pressure
All the variables increased fuel consumption to some degree but there were some surprises in the magnitude. With the tire pressures reduced to 20 psi, the mileage dropped just over 0.6 mpg to 24.73 mpg. This may be due to the same factors that Michelin's Bob Massa talked about during the Audi Mileage Marathon. Modern steel belted radial tire construction actually results in very little deformation of the contact patch with tire pressure. Just as pumping up the tires above recommended values would yield little improvement in mileage, so too it seems at least at this pressure it has little impact. Perhaps if the pressure dropped down to 10 psi more difference would be apparent. Check out the rest of the results at AutoExpress.
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