A second car doesn't make cents/sense for everyone including myself.
My '03 2500 Dodge/Cummins HO NV5600 3.73 gears averaged 21-21.5 mpg on a 660 mile a week commute.
The truck pulled my 11200 lb 5th wheel RV and my other trailers up to 16k.
I tried the small car thing but cost of the car and fuel/insurance and keeping it reliable for a 110 mile a day commute for a year was adding huge costs.
The OP 6.4 Ford truck doesn't give the best mpgs as my neighbor found out with a brand new '08 6.4 F350 DRW 4x4 crew cab truck. His commute is just over 65 miles a day and at 13-13.5 mpg, high fuel costs was eating him up plus adding 48k miles the first 22 months. He now drives a small two door car. However he says he isn't saving any cash but at least he isn't running the odo up on the DRW.
I would look into a tow truck that can average 20+ mpg not towing for your commute but can pull a 10k trailer.
