“What I Learned Today” With Jeff Smith — Ethanol Isn’t The Bad Guy
Also note the effect of high portions of Eth on the distillation curve.
However this phenomenon can also be seen in the RFG testing of MTBE fuels even without the Eth.
Details of that graph and the other I made using the data from Durbin, et al. here
Video of boiling point of fuel (ACE Optimal Blend Study 2007, Durbin et al CRC-E67)