"nrp" wrote in message
ps.com...

What does gasahol do to the
fuel system that is destructive? For that matter, what damage does it do
to
the engine?

1) You will only get 95% of the engine's output power compared to pure
gasoline,
2) Your fuel system elastomeric seals, diaphrams, floats etc are not
compatible with any substantial alcohol content,
3) The vapor pressure of the alcohol-laced fuel is higher,
4) The long term storage properties are horrible.

Did I miss any?

Sort of..., #'s 1, 3, and 4 don't answer the questions. While #2 seems
to reply by alleging incompatibility, it doesn't state the damage. How are
those components not compatible? Do they explode?
Maybe you could direct me to a white paper that describes the problem
between elastomers and alcohol. So far, I've looked at four companies that
manufacture elastomeric seals and find nothing to uphold the claim of bad
chemical reeactions.
On the other hand, I find a couple of references dealing with problems
using elastomeric seals that have nothing to do with alcohol. Additionally,
I found more than one company (B.F. Goodrich, for one example) that
manufactures elastomeric products specifically for use with alcohol(s).