I highly doubt that the superchargers installed to date (December 3, 2014) serve 80% of the U.S. population. Further, a quick look of Tesla's map for 2014 shows superchargers installed along, for example, I40 between New Mexico and Oklahoma, and I10 between Texas and Florida, or the stretch of road between Kansas City and Kentucky. These do not exist to date, but for one supercharger under construction in Louisiana. These routes are just examples of routes Tesla indicated to have superchargers installed by the end of 3014.
I like my car very much. I am also a stockholder. But this is another example of Tesla making overly optimistic projections. Actually, with respect to the superchargers, I really feel they are neglecting the U.S. (except for California and the east coast) in favor of Europe and Asia. Yes, Tesla added about 86 superchargers in the U.S. during 2014 (to date). But they don't deserve a pat on the back for that when they indicated they would have a much larger number of superchargers (approximately 60 additional superchargers to bring the total up to 200 superchargers).
Tesla projected 200 (actually 201 per their map) superchargers by the end of 2014. If they end the year with 140 superchargers, that is 70% (140 divided by 200), which in school gets you a grade of C. Even if they reach 145 superchargers by the end of 2014, that is only 72.5%. Another way to look at it is that they projected building approximately 150 superchargers in the U.S. in 2014 (200 indicated on the 2014 map minus 50 that existed at the end of 2013). With only 86 superchargers built to date, that is a completion of just over 57%, which is a failing grade in school.
I hope that when they revise their maps for 2015, Tesla will be more realistic (some would say truthful) with their projections.