On Twitter, Bill Cameron offered copies of the July/August 2015 AHMM, featuring this Skin Kadash story, and I was lucky enough to get one. Kadash is a cop in Cameron's loose series of novels, but "Heat Death" serves to introduce him to new readers while on a road trip to Canada with his only friend, Tommy, in the summer of 1971.
Expecting to be drafted into the U.S. Army, Tommy's motivation for the trip is to rendezvous with a woman he's fallen for, named Instance. Skin goes along to keep Tommy out of trouble, and only narrowly does so. As he sketches a younger Kadash, Cameron evokes the freedom of a road trip and the tension of the times equally well.