Some other issues with ye ole pump E85 is what they use to denature it. Sometimes they use something called "natural gasoline", and it's the dregs of the gasoline world. When fuel costs are high, you can bet it's the fuel of choice.
You can water test E85 with a graduated beaker, and determine what percentage the ethanol is. Doesn't tell you what's in the "gasoline" side, just how much.
I've gone to VP C85. Works great with nitrous, and makes more NA power than any pump mix I've found. Trouble is, it's a little expensive, like 5+ bucks a gallon, and it's chock full O MTBE, and some other unsavory additives. Up side is, whatever anti corrosion spooge they use really works. Can sit, and sit without turning to white goo.
At the one place I bought from I always went inside
to see the drop sheets for the E-85... all of ours
in the Detroit area was a 2 part drop... ethanol and
the regular gas... it told what it was and the percentage
(number of gals each).. at first(the first couple times
they looked at like I was crazy) until I explained what
I wanted to see.. usually the manager understood... then
I could see the total content of each component.. after a
few times they knew what I was asking for... plus they sorta
got use to me
