As an American expat living in Italy, I've been able to save for retirement and live well on a tighter budget.Su GuilloryI moved from a big city in California to a small mountain town in Italy about three years ago.My monthly expenses are generally much lower here than they ever were back in San Diego.Here, I'm confident I can actually afford to retire one day and live well on Social Security.Amid the cost of living crisis, it's become challengi…