Global spending on motorsports sanctioning bodies, teams and tracks is expected to total $5.43 billion in 2015, up 3.2 percent from $5.26 billion in 2014, according to the latest findings from IEG Research.The number lags IEG’s projected 4.1 percent increase in overall global sponsorship spending due in large part to economic conditions in Europe.General Motors Co. is the most active sponsor of motorsport with 12 percent of properties reporting a partnership with the auto giant. Ford Motor...