hi i have a 1994 f150 super cab 4x4 with a 4.9 and 31 in tires now i realize that i wnt get the 19 mpg that some of the 2wd short beds will but i had 35s on and i got a low 13 now with the 31 i am getting a high 13mpg. yes there is a body lift on it but i drive fairly easy dnt usally get up to 60 and still get that 13mpg. i was wondering if anybdy here knew if that increase was about right or weather it should have been more
thank you for your time

 

Is it automatic? What is the gear ratio? You can get the gear ratio off the drivers side door jamb....Personally, I'd venture to say you should be getting 15-18mpg....I can get 19/20 mpg highway, with a 4.9, standard cab, long bed, 2wheel drive, manual tranny....

Have you did a good tuneup? Plugs, wires, distributor cap and rotary button? Changed tranny an differential fluids?

 

[QUOTE=SideWinder4.9l;10252253]Is it automatic? What is the gear ratio? You can get the gear ratio off the drivers side door jamb....Personally, I'd venture to say you should be getting 15-18mpg....I can get 19/20 mpg highway, with a 4.9, standard cab, long bed, 2wheel drive, manual tranny....
3.55 rear gear raitio and it's a manual 4x4 I dnt expect the 18 but I think I should get more than 13 and no I haven't done a tune up yet will that help out alot?

 

When I first bought my truck, 15mpg was the number I got no matter what....Did a full tune up, and other, doo dads and now I love my mpg, for a truck that is...Here's a quick list to do...

-Plugs-Autolite coppers or Motorcraft coppers
-Wires-I personally have Duralasts on mine....
-Distributor Cap-Important to get the BRASS tabs, not the crappy silver ones....
-Rotary Button-Same as ^...Get the brass pieces...
-Change air, fuel and tranny filters
-Change tranny, transfer case, and both differential fluids
-Get it aligned; If its out of alignment, it wont roll freely
-Check steering components...I did mine all new from balljoints to balljoints....
-Clean the engine off, a dirty engine runs warmer, only slightly, but you'll see a minute difference when it's clean, and you'll be able to see leaks...

Now, with all that ^, you MAY see 15-16mpg, as your truck is a 4x4....those parts really have a effect on mpg...Another thing, is your front valance in place? Its the plastic piece under the bumper...If not, get one, as it pushes air around the vehicle, instead of under it...All those things I have said, by themselves, are really only good for maybe 1/10 of a mpg, but you put'em all together, and it adds up...

Do you have a toolbox, carry extra un-needed weight? If I remember correctly, for every 100lbs you shed, it will equal roughly 15 better mpg....Just a thought..

-Wes

 

No extra weight I just had an alignment and pretty much all tie rod ends replaced right after I had the tires replaced. I didn't know that these trucks came with valences on them. So in theroy if I replaced thoes things it should increase my milage?

 

Try some seafoam, always works.

 

i have always heard about the stuff what exactly is it?

 

Its a concoction of chemicals that clean among other things-carbon build up. Ive used it on everything with no issues what so ever. What you do is turn the engine over, pull the PCV and suck up about 1/4 of a can slowly letting the engine chug but not shut down. Then shut the engine off and wait an hour, crank it back up and it will smoke like nuts and then take it for a short ride around the block a few times. It will smoke but go away and the engine will run much better.

Only time I would advise not using it is if you have horrible deposits built up-like engine sludge. This is evident if you pull the valve covers the rockers will be covered in goop that was once oil.

 

ok that makes sense i have always heard of it but never knew what it was