I recently bought a 97 Crewcab longbed automatic 2wd F350 with 141.000 miles. I just monitored my first tank of diesel and it ran around 13.5 mpg. I did tow a 5th wheel on that tank, but only for about 5 miles. Is this what I can expect for this size truck?
I have no idea what the gears are, the truck is bone stock. I've replaced the air filter with the BIG Napa filter, and I'm driving as much as possible under 2000 RPM

 

what rpms are you hittin at 70 mph

 

70mph runs me around 1800 RPM's (I think)

 

you probably got 355 rear end like me idk i get anywhere from 18 to 22 mpg empty never checked with load but everybody gets different mpg is fuel filter clean and oil changed regularly

 

have not checked those. The truck has been mine for only a couple of weeks. I need to get it fully serviced so I can keep track of service miles and dates.

 

yea when i first bought mine the catalytic converter was clogged and the fuel filter was down right nasty

 

Always when you buy or even are looking at these trucks check out the dipstick, blowby, fuel filter, air filter coolant excetera to see if anything is wrong with the truck.

Change it all so that you can keep an eye on things.