4 Min Read HOUSTON (Reuters) - Exxon Mobil Corp is lowering its ambitions for oil and gas output, it said Wednesday, as it focuses on cutting costs and preserving dividends to win back investors that have soured on the company after years of overspending. FILE PHOTO: Darren Woods, Chairman & CEO of Exxon Mobil Corporation attends a news conference at the New York Stock Exchange (NYSE) in New York, U.S., March 1, 2017. REUTERS/Brendan McDermid/File Photo The top U.S. oil producer incurred a historic loss of $22.4 billion last year and is trying to convince a skeptical Wall Street that it can rebound after years of overspending left it deeply indebted and lagging behind rivals better geared for a world demanding cleaner fuels.