i'm almost at half probably close to 5/8 more like it and i'm just about at 80 miles

 

hmm i think i hit 80 at 3/4 and around 160 at 1/2 and now 225 right above 1/4

 

thats pretty much typically what i get, and with 33x12.5.

right now though, i think i got a bad tank as im no where near my normal numbers.

 

i get 26 mpg on the freeway its lifted with stock tires 355 gears though about 18 street

 

Dont get an exhaust if your on a budget, your not going to notice much, and its certainly not gonna give you THAT much better MPG....Overinflate your tires a little for rolling resistance, and rive slow<<<Best advice IMO

 

When your talking about mpg cold air intakes won't do anything for you. An aftercat exaust usually won't help much. But it will a little.

When it comes to low throttle efficiency you gotta do two things. Reduce pumping losses and reduce rpms.

Pumping losses really are caused by the throttle plate. You gotta open it further. And the only way to do that w/o increasing fuel usage is with the tune. (leaning it out and adding egr)

Lower rpms are the most effective thing you can do. It's even more effective than taking off like a grandma (aka jack rabbit starts).

I'm sitting right at 20.5mpg avg now. And I usually do about one good 0-60mph blast a day too.

Driving technique is really the key. If your on the brakes your wasting gas. And if you over 2000rpms (except on the freeway) your wasting gas.

Rich

 

i get 14 on average.

 

Holy thats bad mpg hehe.. but i guess with a truck like yours its probably not as bad as it could be.

 

I have an average of 12 to 16

 

i was running my radial xtx's at like 45-50psi because i was trying to get less rolling resistance but it didn't change anything

 

I only get 11.7 mpg and I've done everything I can think of to try and get that up. I got a K&N intake Gibson extreme dual exhaust Bosch O2 sensors all around new spark plugs spark plug wires I use the castrol gtx for engines with 75,000 and over and I use seafoam every 3000 miles. I do run 31x10.50 tires but those come stock on the newer fx4 rangers. I got the 3.73 gears and I,m getting ready to change the fluid. I might just get the worst mpg for a 4.0 on r-f

 

Have you checked for a dragging brake?
With as many miles as you have on it.. you just might have a calipar that not releasing.

 

After reading all the fuel mileage mods that can be done I found the best fuel mileage mod ever! I drive the speed limit and don't get on the throttle all the time.

 

On my OHV 4.0 5spd I usually get around 20-22. But I usually drive easy, and I take short shifts most of the time.

D I want your truck!!

Mine runs 1500 rpm at 60,
1300 at 85, insanity.

 

How would I find out if thats happening? there is a squeak in on of the brakes could that be it?

 

You could lift your truck up off its wheels, and turn each wheel and feel for any drag.

 

When I was up in WY at 7200 ft, my record low was about 10.5 mpg. Turns out my MAF sensor was damaged (pesky mud hole), it was throwing codes about every 2-3 days, got a rebuilt one for $100 and a little careful driving, I'm averaging between 17-18 mixed city/ highway. I'm also down around 1000 ft now, but that doesn't seem to effect gas mileage as much as it does acceleration. I have the 4.0 ohv with 3.73s, but it seems like the sohc 4.0s get 3-4 mpg better than us, and have more hp.

What about the 5.0 guys, what kind of mileage do they see?

 

i would think better cuz your not over working the motor at that power, if it was me i would get alot worse i'd just be in the throttle more

 

Just got my 32s mounted and will report back once I've run several tanks of fuel.

So far My rpms have dropped 100 at 70mph. (now running 2415rpms w/4.10s and 32s)

Rich

 

Rich, did you recalibrate your speedometer for the larger tires?

If you didn't, I wold expect the TACH to speedometer readings to stay
they same, with a speedometer error with the larger tires.

 

the Tach will read accurate no matter the tire size. they are unrelated.

The speedometer will be off.

 

I agree that the TACH will be accurate, and if the speedometer hasn't
been calibrated, the TACH reading to speedometer reading should be the
same as the smaller tires.

 

Thanks for the concern Bob. But I'm way ahead of ya.

I've not only adjusted the tune.. I had the tune written before I even got the tires.

I do wish however that I could make the speedo read what the PCM says.
There's a bone fer ya Bob. How can I correct that?
I suspect it can only be done via the guage cluster?

Rich

 

That's great Rich, so you are seeing the true difference in RPM, vs speed since you calibrated for the larger tires.

One way to try and calibrate your speedometer in the instrument cluster is rotating the needle slightly on the shaft of the speedometer. If the speedometer is reading slow, you will want to rotate the needle clockwise (driver's view of the speedometer), if it's reading fast, you will want to rotate the needle counter-clockwise. I'm not
familiar with the Ranger speedometer , to know if you can hold the shaft stationary, while rotating the needle very slightly.

One concern I have, however Rich, is the accuracy of your tuner in displaying information.......a recent example being the timing information.
Do you have a GPS you can compare your speedometer and tuner (PCM)speed against?

 

dang 20mpg is really good. i can barely get 16mpg from mine. but i have the OHV not the SOHC. does that make a difference in mileage?