moondawg:
to reiterate some of the responses, it is difficult these day's to know whether you have ethanol.
my reasoning is how the renewable fuel standards was implemented by the government. the government only set or sets a standard of amount of renewable fuel that has to be met and then let or lets the individual states decide how they will meet it.
consequently every state can be different as to how they wrote their own renewable fuel act. for example attached is a link to my own states act in missouri:
http://agriculture.mo.gov/weights/fuel/renewablefuelstandard.php
yesthatsteve mentioned it, and i would add that based on the literature, in my state all gas must have 10% ethanol blended except for the exemptions listed. however and in particular related to the pump sale of 91 or higher octane fuel, if you read further in literate and I quote it here
"Missouri does not require ethanol labeling on gasoline dispensers.
Therefore, if a consumer has a specific application that requires a fuel without ethanol, the consumer must purchase premium unleaded gasoline with an octane of 91 or higher that is also advertised as not containing ethanol"
My point for emphasis, is that just because the pump says 91 octane(or higher) in Missouri, does not alone guarantee that you are getting e0. There is further literature in the MO RF Act that says that this exemption of 91 octane e0 is left up to the individual station, therefore the advertising requirement in the above quotes.
I tried to find the Texas RFS act, but was unable in finding this on the www. Perhaps someone else may have a link. Reading up on your own states RFS or act is one way to get an idea on what your state is doing with regard to meeting the Federal RFS, but it is in no way a guarantee of whether you will get e0 gasoline because as I have said before this RFS has become a bit of a convoluted mess in my opinion. There are many threads on this forum with many discussions related to the subject. I encourage you to search and read up on the discussions.
When traveling across country as I often do, i simply add chemicals that i believe may help with the ethanol and water issue, and the discussions on whether these help or not, still leave me on the fence as to whether I am really helping or not, but i add them any way.
My post on the ethanol testing kit was really intended to make light of the issue, as I always post that these days, it is extremely difficult to know whether or not you are getting ethanol or not.