NEW YORK, Oct 15 - Revisions to the August U.S. retail sales data overshadowed the slightly bigger than expected decline of 0.2 percent reported in September, leading investors to snap up dollars and sell euros and yen. The euro sold off after the report showed August retail sales revised to a 1.2 percent gain from the original report of a 0.6 percent increase. The euro fell to $1.1639 , a loss of 0.75 percent on the day from around $1.1670 just prior to the report. The dollar also climbed higher against yen, trading to 109.46 yen to 109.62 yen, representing a gain of 0.75 percent on the day. In addition to the retail sales data, the Empire State Manufacturing Survey, a report on New York's manufacturing sector, surged to a record high 33. 7 in October from 18.35 in September.//