i get 450 is there something i can do to get better?

 

Chip it I guess?

 

I pull off 550 on level 7. stock i had 530 per tank, and when I had banks 6-gun I actually got an amazing 630.(but no *****)

 

750-850 best tank to date just over 26mpg hand calc. speedo etc corected/verified via gps.

bone stock i was getting 700-750

 

I have a 60gal RDS and when I fill up with 88 gals. I get 1300 straight HWY. 1300/88 = 14.8 (now that's at 80-85Mph!)

The one time I slowed down I got 1500 out of it going to Florida empty.
That's a flat 17mpg and being granny grumps. I simply can't do it so I live with the 13's and 14's.

More like 11 in town. 7 pulling a backhoe.
This is 04, 48re HPFP only.

 

Just got back on a 433 mile trip to Durham NC checked gauge reading 1/2 tank. When I bought the truck it was stock and could only get 326 on 1/2 tank. Then the mods. began tone ring,torque tube baffle removed, 4" hole in bottom of cold air box with a K&N high vol. filter and the best mod you can do to a 2003 3500 so 48re srw QC with 373 is a Edge / Monitor (set on level 3). This is in the rolling hills of NC. not flat cow pastures of ? ps hot day ran air.

 

Since my level kit and 35" Toyo MT my mileage is really bad. Stop and go farm mileage is bad anyway, but dang 300 to 350 a tank.

 

im not much better then that!! maybe 400 to a tank with xzt box but i do have 410s !

 

All of you have me beat...usually around 300...

 

Never beleive your fuel computer. I find that it is normaly off 5 to 7 MPG off reading higher than what you really get. Check your mileage to your fillup's.
Pulling a 48' flatbed I normaly get about 10.5 to 12.3 driving 70 to 75 mph. Never checked without the trailer as I just use my truck for business. If I reset the fuel computer without a trailer it say's 23/24 but like I said it's never correct with fuel used over miles driven.

Mark

 

OK-- Just filled er up--

726 miles-- 34.8 gals. -- 20.86 MPG -- overhead read 21.8.

Running Smarty Beta 4.4 sw3

 

After reading all this, im starting to think I shoulda got a 6 speed.

 

I am around 530 miles per tank with a mix of city and highway driving.

 

05' Auto. Added Muffler Delete, 4" PVC in airbox, Amsoil drop in filter, replaced baffle tube with 5.5" aluminum, Quad Std on 60hp. I fill up at 1/4 tank which is usually 470 to 520 miles. I have not run below quarter.

 

Pulling my 5er(8000lbs.), I get about 400miles highway at 65mph,about 12mpg.