RE: gasser line
CharlieP,
I don't dispute that alcohol attacks certain parts of older carbs, however the "modern" components of carbs appear to be immune to this due to changes in materials used.
The reason I drain my fuel tanks after flying is done is that I store my aircraft nose down in the vertical position. If I forget to defuel I will have the smell of gasoline in my garage, not good.
I don't ever run my carbs dry and have had no problems with engines that have not run for more than a year. Milage may vary for others, of course.
Bliksem