Costco - COSTCO
2195 E Custer Ave, Helena MT
406-495-7040
Ethanol-free octane ratings: 91
GPS coordinates: N 46.61545 W 112.00250 (entered by Jonathan Lathbury)
Updated by Adam, June 26, 2016 15:10 CDT
Admin says it's no longer ethanol free
Updated by Lee, June 24, 2016 1:18 CDT
Premium is no ethanol
Updated by Lee, June 24, 2016 1:14 CDT
Reactivated.
Removed by boomer, January 29, 2015 9:05 CST
per above comment, plus comment reported separately to the COMMENTS page, deleted
Updated by Jonathan Lathbury, January 15, 2015 20:44 CST
Added GPS coordinates.
Posted by Woody, December 14, 2014 11:07 CST
Reverted back to no ethanol