(Bozeman, MT)  --  A top executive of a Wisconsin-based gas station and convenience store chain was killed in a motorcycle crash in southwestern Montana Wednesday.  Fifty-five-year-old David Erickson of Lakeland, Minnesota drifted off the road, went over an embankment and hit several rocks.  Erickson's wife, who was a passenger, suffered minor injuries.  Officials say neither alcohol or speed were factors in the crash.  Erickson Oil Products Inc. and Freedom Value Centers is a family owned company with 65 stores in Minnesota, Wisconsin, South Dakota and Michigan.