Uber taxis are the most-expensed form of ground transportation in the US

"In the three months ended in June, Uber overtook taxis as the most expensed form of ground transportation, according to expense management system provider Certify. Uber accounted for 55 percent of ground transportation receipts compared with taxis at 43 percent.
That’s a big jump from just the beginning of the year. In the first quarter, Uber Technologies had 46 percent of receipts tracked by Certify compared with 53 percent for taxis."

Source:  Skift, 16th July 2015