What does gasahol do to the
fuel system that is destructive?

Nobody has hard data. All fuel system tests have been with pure alcohol in
a lab beaker. Sort of like feeding rats 100% saccharin and then noting an
early rat demise.


For that matter, what damage does it do to
the engine?

None. As a matter of fact, it cleans the hell out of the upper end.



1) You will only get 95% of the engine's output power compared to pure
gasoline,

Yes, at 100% ethanol. What is the output power degradation at 5% ethanol
concentration? 0.05% or something like that.


2) Your fuel system elastomeric seals, diaphrams, floats etc are not
compatible with any substantial alcohol content,

Your source for the study and verifiable results, please?



3) The vapor pressure of the alcohol-laced fuel is higher,

Your source for the study and verifiable results, please?



4) The long term storage properties are horrible.

Certainly you must be kidding. I've got a bottle of Everclear that must be
30 years old and still has the same effect as the day I opened the bottle.
Alcohol has a MUCH better storage characteristic than gasoline.




Did I miss any?

Most all of them.


Jim