I posted this in tow and haul. I have a 2002 Duramax Diesel short box ext cab 4x4 60,000 miles. The mileage it gets empty is around 20 mpg With my 5 th wheel 8,000 lbs. 10 or 11 mpg. I am thinking of buying a new 2006 Ford quad cab with a 6 liter diesel and wanted to know what the mpg on these beast are. Also any good points/bad points are. Thankyou.