Here is a link to a very good article comparing two 4x4 extended cab short bed F 250's, one with a 4:30 geared V10 gasser and the other being a 3:73 geared 6.4 diesel.
http://www.dieselpowermag.com/features/ford/0707dp_2008_ford_super_duty_gas_vs_diesel/index.html
http://www.dieselpowermag.com/features/ford/0707dp_2008_ford_super_duty_gas_vs_diesel/index.html