Yeah, Marathons are just as much hen's teeth in unicorn's mouths as 76 and Chevron are, around here.
BP is my only other (name brand) not a crazy distance away, accessible choice besides Shell, Sunoco, Exxon/Mobil, and Russkieoil (Lukoil),
if anyone considers that last one an actual 'name brand'.
It's bad enough I would have to do an overland trek to get E85, now I must do a road trip just to get plain old effing 93 which will 'work' with tunes?!?!?