WASHINGTON—The National Highway Traffic Safety Administration has concluded that tire pressure monitoring systems are effective in combating under-inflation of tires.
The agency said it studied tire pressure in more than 6,000 vehicles. Of those without a TPMS, 23 percent had at least one tire showing an underinflation of 25 percent or more. In those fitted with a TPMS, the figure fell to 11.8 percent.
“Based on these results, the presence of TPMS on a vehicle of model years 2004 to 2007 is estimated to result in a 55.6-percent reduction in the likelihood that the vehicle will have one or more severely underinflated tires as defined by FMVSS No. 138,” NHTSA said in the 58-page report.
NHTSA extrapolated the data to conclude that during the first eight years of operation, TPMS is estimated to save a typical passenger car 9.32 gallons of fuel and a light-truck vehicle 27.89 gallons of fuel.
The agency said during 2011 TPMS saved an estimated $511 million in reduced fuel consumption in the U.S.