The biggest problem with E10/E15 is shelf life of the fuel when bought raw from fuel blenders. Most of the big name stations have dealt with this through the use of newer additive tech in their tanks, but small independent stations or other bulk customers like in agriculture have starting seeing quite a few problems in their bulk tanks when untreated. For a while now there has been a huge need for Diesel additives that polish the fuel/tank and prevent issues such as microbes or water intrusion that typically wasn't an issue with gasoline. Any of you guys that have ever gotten a bad tank of No2 know what a headache it can be. Now we're seeing issues in the gasoline tanks where the Ethanol will attract water, phase separate out to the bottom of the tank, and then start growing microbes in the boundary layer between the fuel and the water/ethanol mixture. In high humidity environments like we see here in South Central Texas and along the Texas coast this can happen rather quickly and ends up being very costly. You end up with lower octane fuel in the top layer, a useless water/ethanol layer, corrosion in the tanks, and microbe intrusion. One of my distributor customers has told me that the take rate on supplemental fuel additives for gasoline has recently taken off with some of the biggest initial skeptics being the customers buying the most after having dealt with the pitfalls of E10 blends in their trucks and equipment.
