Alternative fuels may further lower the cost of running corporate fleets.

But while the Sable died last year, the Taurus soldiers on as a favorite of corporate fleets.

"We have a black Tahoe on the corporate fleet."

Business jets of all sizes make up nearly two-thirds of the total domestic corporate fleet.

Vehicle insurance, both property damage and third party liability of corporate fleets and vehicles, is also quite commonly covered.

Boeing and White Lodging Services already base their corporate fleets here.

That may help explain why companies are willing to give departing chief executives use of the corporate fleet.

Most of the registered hybrid cars belong to corporate fleets due to tax incentives established in the country in 2008.

Even corporations with big corporate fleets depend heavily on commercial aviation for most of their business travel, he noted.

The company has been working to reduce its sales to less-profitable businesses like rental car companies and corporate and government fleets.