All of my relation (Sicilian both sides) definitely do NOT drop vowels at the end of words. I thought it was more an "Italy" (rather than Sicilian) thing. I'll hear someone say Provolone and to me it's pronounced "Provolonie".
TIS
"Mankind must put an end to war before war puts an end to mankind. War will exist until that distant day when the conscientious objector enjoys the same reputation and prestige that the warrior does today." JFK