Des Moines, IA, 2016-Sep-16 — /EPR Retail News/ — To celebrate E-15 Day, Kum & Go will offer E15, a fuel blended with 15 percent ethanol and 85 percent gasoline, for $1.15 per gallon at many Des Moines-area Kum & Go locations from 8 a.m. to 5 p.m. on Friday, September 16. (See below for a…