Increase in Ethanol?

I looked at the list of pure gasoline stations in Texas. There was one Exxon station in the list. The rest were non-top tier or even unbranded gasoline. Is there some rogue refinery out there producing pure gas? Not quite.

What I understand is that there are a couple of SAE gasoline specifications intended for motor vehicle dispensing that are distributed via pipeline from the refineries. Neither of these contain ethanol. Ethanol is introduced at the local terminal as part of the additive package delivered to the retailer. This is how we get some gasoline with ethanol and some without. (Hint ethanol "oxygenates" gasoline). This means that virtually all top-tier gasolines contain ethanol. This is the best, most easily understood presentation of the compounds that make up gasoline that I've seen.

http://www.ask.com/wiki/List_of_gasoline_additives

It seems that a recent SAE symposium on fuels is trying to hold the line of one fuel for the legacy fleet (us in the old car business/hobby) at E10. Eventually, gasoline is going to wind up at E20-E50 for the rest of the country. There may still be E85 as a niche market solution.

One of the interesting notes I read was that a 5 point rise in octane raises greenhouse emissions by 15%. It seems that higher octane gasoline needs more refining steps, so the cost difference is not all marketing hype as some have groused.