The test for ethanol is easy. Get a small (narrow) jar or test tube. Mark a
line about 1/10 from the bottom. Fill with water to this line. Fill the rest
with gas. Shake well for about 30 seconds then let the water settle out. If
the water/gas line is above your original mark, you have ethanol.

mike

"M" wrote in message
ups.com...

Anyone has done the test of dropping the alka seltzer into mogas known
to have ethanol? Did it fizz?

I can definitely say that alka-seltzer does not fizz in ethanol free
regular gasoline. Just tested it today and Jay did that a few days
ago. Now I end up with this pack of alka-seltzer that I need to know
if I should keep it in my fly-bag!