i just bought a 2004 f250 crewcab lariat 6.0 diesel with 60,000 miles. i drove it from north carolina to massachusetts (890 miles)and got 16.5 mpg. now i filled the tank and drove 63 city miles, then filled the tank again (9.165 gallons). 63 divided into 9.165= 6.873
the only thing i saw was that the air filter was extremelly dirty. i would say it was never replaced(60,000 miles). i went to walmart and got a fram air filter for $72.00 and replaced it now im praying that the milage will go up. what do you guys think? is there something else i should ck.

 

When you say filled what do you mean?? I can get about 4 gallons in after the nozzle ckicks itself off, I fill mine to the brim when doing a mileage test/before and after

 

hmmm i didnt know that. what i did was as soon as it clicked i round it to the dollar, i looked in and i saw foam(bubles) so i stoped. i figure i do the same thing the next time around.
OK so tomorrow morning im going to pump till it gets to the brim. i will let you guys know in a couple of days.
ANYTHING ELSE I SHOULD DO OR LOOK FOR?
also in the morning i warm it up for about 5 min, should i warm it up more? it takes for ever for the temp to go up just by idleing, but once i start driving i goes up to normal and thats when i get full power
temp in massachusetts has been 30* in the day and single digits at night and mornings.
i always plug her in.

 

When you fill it up and the nozzle stops. Let the foam go down for a few seconds. Repeat process till you can see fuel with NO FOAM starting to come up the filler neck. Usually takes a few extra minutes to fill up. But you get about 3 to 4 gallons more in the tank. I will pull the nozzle handle till the flow is just a trickle going in. It wont foam as bad.

 

how many mpg yours get

 

16 in city 18+ on highway, no tuner. Only 4 inch exhaust, i see best results in cold weather here in New Mexico this past winter has been amazing for the truck. Be sure to check fuel filter too.

 

I average about 16 mpg. But of course I have a lead foot also and like to **** off the rice burners.. No mods other then a 4 inch exhaust that exit in front of right rear tire. Most I have ever got on a FULL tank was 502 miles. So thats 32 gals by 502. 15.98 mpg IM sure id get a whole lot more if i could keep it under 75 mph.

 

something is really wrong with my truck to get 7 mpg city
my fuel and transmission filter will be arriving on monday, i order them on ebay.
today i have the whole day to mess with the truck, so if you guys could think of anything else i should ck let me know, even if it doesnt have to do with the gas mlage.

 

Pull your EGR valve out and check for carbon build up. It may need to be cleaned.

 

nice, ill do that today too
thanks