Increase in Ethanol?

Gas when produced, whether Exxon, conoco, etc... Is all the same. Only the octane rating changes. It is at the terminal where they add the additives, cleaners and solvents, that make it top tier. Tis is also where they add ethanol which is usually shipped in via rail. They produce the stuff at refinery, ship it via pipeline to a terminal and from the terminal all manner of gas station brands get the same gasoline and add the additive to make it Exxon or what ever. If it wasn't for government subsidies ethanol would be more expensive to produce than gasoline.

I used to deliver bulk fuel. I have even had to add the additive to the gas at the station on a few rare occasions.

A truck is just a carrier of the fuel. They make money on how much is delivered. I delivered for an Exxon distributor, but have delivered unbranded gas and other brands to non Exxon stations.