E10 distillation curves

[fishnjim]

I had this for years but could not locate in past discussions.   
Lots of discussion about ethanol gas and vapor lock, so here's the data.
The graphs on the upper left are the ones, just different data sets.   This study was with a range of alcohols.
Just be informed when viewing that the lower the points on the curve the more that evaporates/easier to evaporate.   E10 is what is at the pump usually.   Notice the temperatures also.   The explanation is that the ethanol forms some lower boiling azeotropes with the mid distillates and that what promotes the evaporation.   
There are other articles out there with different conclusions about the effects to environment, etc but do not impact this issue.

note:This excerpt is from an ACS publication that I obtained with my dues allocation years back, if the trademark people are worried.   

[Michael Petti]

Thanks for publishing this. It at least partially explains why my 1960 390 runs much better below 70 degrees than upwards of 80 degrees.