It affects some Hyundai owners as well. They can get more info at
https://hyundaimpginfo.com/ .
Note (from the Kia web site) that they are ....."voluntarily adjusting the fuel economy ratings for approximately 900,000, or 35 percent of, 2011-13 model year vehicles sold through October 31, 2012". So a specific car might or might not be involved.
They're even addressing the situation for
former owners of the affected vehicles as well.
Seems as though the companies are trying to do the right thing.
Bill