A friend at the office bought a "first year Toronodo."
Recollection is that he had the carburetor rebuilt at least four times the first year.
That was in Milwaukee, where some of the gas suppliers were putting "winter additives" in the gas to improve cold starting at low temperatures, and the additives ate all the "rubber" out of the fuel system.
When somobody finally clued him in, he switched gas brands a couple of times, and once he found a brand too cheap to put any fancy stuff in theirs he had no further trouble that I heard of (or maybe summer just got there and they all dropped the additives?).
His problems did provide a sort of lesson for those advocating rapid switch to "high ethanol" fuels. Changing the chemistry by too much does require changes in the engines.