After hitting the doldrums during the summer months, General Motors' stock has been on fire in the second half of the year. Year to date, the stock is up nearly 45% after closing Tuesday's session up 1.9% to $77.16. Over the past six months, shares are up more than 60%. General Motors Q3 facts at-a-glance U.S. Market Share: 17% Electric vehicles sold: 67,000 E.V. market share: 16.5% Dealer inventory: Down 16% year over year EV inventory: Down 30% since June. According to its third-quarter ea ...