bad mpg what to do?

I've grown out of COEs myself. I understand.
When one calculates RPM and road speed it's based on tires being new. As they wear you'll loose up to 3 MPH or gain 50-75 RPM. I'm guessing your tires are about half worn.

 

You're being a douche. If they don't want something on here, follow the rules or get off the site.

 

What do you get for fuel mileage now?

 

I fiiled up in Rolla Mo drove to San Antonio tx you know Missouri a lot of hills averaged 5.2mpg @70-72 mph I will be doing a tune up soon to see if it'll make some difference but 5.2 much better tgan getting 4.5 truck runs great smooth before couldn't even climb an ant hill lol thanks for the recomending me diesel doctor soon will be removing things on this truck if its giving me similar problems if you know what i mean so it cam run like older trucks

 

Looks like you could have an EGR valve problem which would explain the poor fuel economy. When was the last time an over head was ran on this engine? Start with an over head first. Of course if you slowed down you could do a LOT better too.

 

Say it ain't so..... Lol

 

Thats the next thing im doing is the overhead I will be doing it this weekend when im back in Chicago I dont know if swift ever did one im assuming not thats why I will do it myself.
IF my egr valve is bad wouldn't the check engine light be on? Or should I have a mechanic do diagnostic on it? I think I should should just changed it.

 

EGR valves don't always set a code till they get real bad.

 

If you wind that thing up to 2200rpm for shifting on a regular basis you best be laying back some money for an early rebuild.

You may have some other issues but from what you are saying about the way you drive THAT is the MAJOR problem. There I said it but seeing your responses to the others who told you I doubt you are HEARING anyone.

For your own benefit just TRY what you are being told for a day or two. Keep your rpm's down under 1700 or better under 1500. Slow down to 65mph tops and don't cram your foot to the floor till you get to 65.

If you try it for a day or two you will see an improvement even if you have other problems with the truck.

 

I dont druve it at 2200 rpm 1800 tops so I can climbs hills better