What kind of gas mileage should I expect from a 1994 F-350 4x4, powerstroke, ZF 5 tranny, reg cab, 8' bed, and all stock? What would be the difference between a F-350 and F-250 as far as gas mileage? Does the extra weight of a F-350 make a difference, not sure of the weight difference? Is there anything else that would factor in between a F-250 and 350? Not sure of the gear ratio either, what would be the best gear ratio for this truck with the ZF 5 tranny for towing and for gas mileage.

 

I started out getting 14/16 city/ highway. Depends alot on the truck. You'll hear anywhere between 15-20mpg highway stock The only real diffeence in the 250 and 350 is the front axle so weight diffenece is minimal. (gas milage would be 0mpg since you have a diesel its fuel milage).
If your going to pull most of the time 4.10s are the way to go but if only towing a little or not real heavy 3.55s are fine. Thats what i have and the truck does fine grossing 25K combo but 4.10s would make it nicer. I think a couple guys on here have 3.73s out of the superduties in their truck

 

Your mieage will vary on your driving habits.. If you're easy on the throttle and drive at 65 or under you should get close to 20, maybe a little more if you're real nice to it...I can get 20 with my 250