Gas Milage

[Amos 33]

Hi, I'm new to this Forum and am looking for any input that you may have about getting better gas milage out of a RB motor in a 3/4 ton 4X4.
I started the project in 1990 and due to some dificulties just fired it up a couple months ago. we couldn't get the TBI system to work that I bought in 91 so it has a holley 750 on it, its getting 5.69 per gallon, its a mild built 426 Wedge and has been dyno tuned.
Any suggestions?
Thanks'.

 

[DodgeAddict]

Try a Qjet or Holley Spreadbore MPG & RBTruck just doesn't even go together

 

[dgswinger]

i would say thats pretty good mpg for a built rb motor.....my 85 w250 360 trk got 6-8 depending in driving style it was a factory q-jet 4bbl truck with 4.10's

 

[hotstuff]

Is your 750 a vacuum sec. carb ?,if so you need to get some vacuum readings.Then you can tune the power valve and sec. diaphragm spring.

 

[JGC403]

What gears are in the truck? When the 440 was still in my truck it would get 12mpg towing or not. It had the 2.94 rear gears.

 

[DodgeAddict]

My SWB 440 D150 with 4.56 gears & 29X10.5 tires got 8mpg @45mph it ran 7.40's in the 1/8 street driven
The other BB trucks that I had varied with the gears & weight as I can remember
I had one that could smell a gas station 20 miles away A 76' 400/727/3.55 Club D100 LWB

 

[85Rusty]

My SWB 440 D150 with 4.56 gears & 29X10.5 tires got 8mpg @45mph it ran 7.40's in the 1/8 street driven
The other BB trucks that I had varied with the gears & weight as I can remember
I had one that could smell a gas station 20 miles away A 76' 400/727/3.55 Club D100 LWB

He'll! Yours is faster and I'm only getting 7! Lo