Trump administration orders gas to be diluted - what it means for drivers

[ProfessorGAC]

7. Ummmm....

The boiling point of ethanol is 78.4°C
Gasoline has a boiling range of 39° - 200°C, with 50% of fraction boiling below 60°C.
This results in around 2/3rds of gasoline boiling at the BP of ethanol or lower.
I'm not convinced there is a evaporative issue here.
Whether the elastomers in the fuel system are optimized for 15% ethanol is a different matter.
It may be a problem; it may not. But, simply switching without a hazard analysis is foolhardy.
Also, the energy density of gasoline is much higher. 42 megajoules per kg vs 29-30.
So, more fuel will actually be used with E15.
Maybe there's a different environmental concern that comes into play.