I run E85 pump fuel in my race car, it was built to be raced on straight methanol so the E 85 doesn't harm the fuel system. I bought a QuickFuel brand E85 tester and it uses a small amount of water and fuel in a small tube, you put in a specific amount fuel and add the a specific amount of water into the tube and shake it well and wait for the seperation to read the results. It does seem to remove either some of the alochol or water because when you mix the water it will be at the top of the tube markings and after I shake it that tube has less fluids in it than before shaking it