I have been working with a number of airports to get unleaded fuel service on the airports in eastern Oregon under SB-1079. I talked to the airport manager at John Day and asked him to see if his AirBP distributor would also install an SB-1079 fuel operation. AirBP said no, which was no surprise, but what else he told the airport manager was a huge surprise:
"As part of the transition to Ethanol all the fuel refiners in the WA, OR, MT and ID areas have agreed to switch exclusively to ethanol when the usage levels hit a certain plateau, most likely with the next year."
For the pilots in Montana and Idaho, you better be prepared. As of now Idaho has no mandatory E10 law and the one in Montana hasn't triggered and probably never will, but the gasoline companies are going to start distributing E10 everywhere because they have learned how profitable it is. Once the terminals get the ethanol injection equipment installed they have an incentive to blend as much ethanol as possible for the tax credit and currently ethanol is about $1 / gallon cheaper than gasoline. Once a large geographic area goes E10, the refinery can start shipping suboctane to the terminal and pocket the savings. When this happens there will be no premium unleaded clear gasoline available as we have found out in Oregon. The oil companies have also learned that a lot of cars don't handle E10 efficiently and are seeing mileage declines of more than 10%, which means the cars are now using more gasoline than they were before.
I have no idea how the exemptions for premium unleaded in the Montana law are going to work if the law never triggers and all of the gasoline goes E10. Pilots in Montana need to start asking questions. Idaho has no laws to protect the aircraft fuel supply and just like in Arizona premium unleaded will disappear in Idaho too.
Citizens need to work on their legislatures to ensure that all pumps that deliver ethanol are labeled and demand that the clear stock for premium unleaded is always 91 AKI clear even if they are going to put ethanol in it. Once it goes suboctane, there will be no 91 AKI clear available. Finally, you need to enact a law that ensures that if ethanol doesn't make gasoline cheaper, it can't be blended. Our mandatory E10 law in Oregon has no such protection, we have to blend ethanol because you can't sell the gasoline without it, so the terminal has to pay any price for it and right now Oregon has the highest gasoline price in the four northwestern states.

