I've owned diesels for almost 4 years no and have never even come close to experiencing an emergency cause by an inability to find fuel.That includes having driven in about 25 different states and two Canadian Provinces.It's true that not *all* gas stations sell diesel but more than enough of them do so that it's not a problem.Of course it's not wise to let your gage get to "E",particularly in an unfamiliar area but with diesels it's not wise to do that *anyway*,even if diesel was sold at every single station (different fuel pump design).
Not having an emergency doesn’t mean it’s readily available. Just checked things out on my drive to and from the gym, 3 stations, one 16 pump, two 8. 16 pump station didn’t have diesel on the price sign but had the typical (for this area) 2 pumps of diesel, first 8 pump had it on the sign (but not in a different color) and the usual 2 pumps, second 8 pump didn’t have it. So that’s 32 pumps of gas and 4 pumps of diesel, that’s the difference between ready availability and limited availability. And yeah sure, you can always plan ahead, but because it’s of limited availability you need to plan better.