Kia, with one of the U.S. auto industry's leanest supplies of new vehicles, racked up June sales of 65,142, a drop of 4.9 percent, meaning the automaker gained share in a market on track to fare far worse to close out the second quarter and first half. June was the fourth month in a row that Kia volume declined on a year-over-year basis, but it represented the smallest decline over the period after double-digit declines in March, April and May.