It's not if you are using number of E0 and E85 stations as a measurement of popularity. E85 stations need E85 cars to support them. In 2017, there were 64 new car choices that could use E85. This year it is 44. Before Ecoboost, the popular F150 engine was flex fuel, now it's not. pure-gas.org relies on users to input the stations, the first listing I clicked for Iowa had a comment saying they didn't have E0. An increase in listed stations can simply be more just being added to the database, not an actual increase in stations offering E0. Then not all the stations are actually stations. Listings include speed shops selling high octane racing fuel by the jug or barrel, that's what the three closest for me are. I spotted airports on the Iowa list, and I'm sure marinas are on others. Those two places likely can't fuel a car. But Iowa has 346 sources listed on pure-gas.org, and an ethanol site says there is 288 E85 stations. The most recent number for total number of gas stations in Iowa comes from 2012 at 2398. So someone looking for E0 or E85 will have about a 14% or 12% chance of finding it at a random gas station in Iowa.