<< Don't you mean "30 deg less for ethylene"? >>

No, propylene has lower boiling point.

Well you are right! 
I stand corrected! Marks Mech. Eng. Handbook page 6-142 
boiling temp for pure ethylene glycol is 387 degrees F.
According to Evans propylene glycol is only 369 degrees F.
18 degrees less. Why is Evans not pushing pure 
instead of propylene glycol? Perhaps because the specific
heat is only .575 for pure ethylene glycol.

Paul Lamar
 
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