I found this on the diesel power website...
"According to Ford, annual U.S. diesel truck registrations have increased (about 25 percent) to more than 500,000 a year from about 400,000 in 2001. Ford alone has sold 1.3 million diesel-powered F-Series pickups in the United States since 2001. Sorry, Duramax and Cummins guys, Ford sells more diesel-powered pickup trucks annually than Chevrolet and Dodge combined. So it should come as no surprise that Ford takes its diesel truck business seriously."
http://www.dieselpowermag.com/preview/0702dp_2008_ford_superduty_powerstroke/
"According to Ford, annual U.S. diesel truck registrations have increased (about 25 percent) to more than 500,000 a year from about 400,000 in 2001. Ford alone has sold 1.3 million diesel-powered F-Series pickups in the United States since 2001. Sorry, Duramax and Cummins guys, Ford sells more diesel-powered pickup trucks annually than Chevrolet and Dodge combined. So it should come as no surprise that Ford takes its diesel truck business seriously."
http://www.dieselpowermag.com/preview/0702dp_2008_ford_superduty_powerstroke/