Bad fuel mileage

[WorkDog]

Gentlemen/Ladies,
First time for me on a forum, just bought my first diesel truck and I got a lot of Q's. bought a 97 f350 four door 8' box 7.3 powerstroke 145,000k. Did the math on my first tank of fuel and I averaged 10 mpg city (completely stock truck, easy on the pedal). Looking for a good place to start looking to improve the mpg. Any ideas, suggestions, anything would be appreciated. Trying to keep this short so please ask if u have Q's. thanks

[Motormorgan]

auto or manual? you didn't add much infor but the first thing I would do (if you haven't already) is replace fuel filter, run an additive (diesel kleen), Check tire pressure, Replace stock air filter with NAPA 6637 filter.... Then you get into more costly things like custom tunes, and exhaust. But if the truck is new to you then I would just give it a good look over and see what a few tanks does.. If you do a few of those things and still get 10 MPG thats lower than normal. (assuming your not running 40's). If you still get 10 after doing first few inexpensive things then I would look into things like a faulty EBPV. Welcome to the org and ask any ?'s you have.

[WorkDog]

With this crappy weather here haven't been able to really give it a good look over, doesn't fit in my garage. Auto tranny stock tire size FYI. Those are some good first things to start with I'll give them a shot. Thank you

[kendallcschm]

Originally Posted by WorkDog

With this crappy weather here haven't been able to really give it a good look over, doesn't fit in my garage. Auto tranny stock tire size FYI. Those are some good first things to start with I'll give them a shot. Thank you

i will say this though.. 10MPGs entirely city isn't that bad

[95350PS]

Check the valley underneath the fuel bowl see if you have a fuel leak that was my major issue went from 11mpgs to 14mpg there was a few rubber lines that had seen better days

[351fifty]

Welcome to the org, best fuel mods are, intake, down pipe, and exhaust, keep in mind were still using winter fuel tho and that costs me roughly 4mpg's, but check for fuel leaks, and custom tunes would also increase economy too, deleting the cat and muffler is worth 2-3 mpg's

[WorkDog]

Thanks everyone for all the suggestions, I'm sure I'll have plenty more ?'s along the way. Hopefully I can be of some help to someone sometime. What major auto part store has everyone found to be the best, Napa, AutoZone, advanced, carquest, etc.????

[351fifty]

The ford dealership, and napa

[stealthrunner]

Welcome to the ORG.!!!IF your going to put an exhaust on your truck i put a diamond eye 4" on mine that i just bought!!!Got mine at RiffRaff Diesel..

[_95stroke]

I just bought a 4" diamond eye exhaust too, have to see how easy installing it goes. But make sure all the maintenance is up to date too. Oil does a lot for these trucks. So does a fuel filter change.