There are many companies that will provide ethanol tuning.  It gets dicey as the EPA requires certification of the tunes.  It can be done - not sure why anyone really hasn't taken to task.  The approval process is straight forward - and all you really show is that the car can still pass an emissions test when your done with it.   Oil is looking for any excuse to hang the first big company promoting "mis-fueling".  It is their nuclear option. 

Side note:  Probably every car built since ~2004 or so is flex fuel capable--- and most have the software on the ECU but the table are not available for look up while the engines are running.  No fuels system - except for a select few early "flex fuel" branded vehicle uses an oxygenate sensor.  Almost all use software to predict the ethanol content in the fuel.  It goes like this:  The ECU detect a refill event.  The ECU then monitors the fuel trim (Long Term Fuel Trim to be more exact) when the fuel system goes to close loop feedback.  If the fuel trim is consistently needing to be more rich than usual, it is likely the last refill had a higher ethanol content and the fuel maps change accordingly (its best guess).  

The OEM's do some not-so-great things with this predictive software scheme.  They use it because they don't want to pay an extra hundred $ for an actual sensor.  Super classy. 

If OEM's used high accurate fuel sensors, and predicted the actual octane, spark could be advanced significantly and a fair portion of the "volumetric fuel economy" can be gotten back from high alcohol/oxygenate blends. 

This isn't quite cricket - but experiment with some e85 in you fuel injected vehicles- I think you'll find little more than a check engine light just playing the odds.  If the fuel tables are truly not accessible, then it may stall or not start.  Get the siphon out then :)