Is this normal gas mileage?

[medicbearusaf]

95 4x4 AT 4.0 with 31 10.5x15 tires... try to keep my rpm below 2500 at all times and still only gettin around 225 per tank from full till the gas light comes on .... figure im only averaging 11.5 mpg.. That cant be right...

 

[tbirdsps]

Did you correct the speedometer/odometer when you install the 31" tires? If not you won't be able to compute the milage as the odometer will not record the actual milage nor will the speedometer be correct.

Just a thought.

 

[medicbearusaf]

i didnt install em i know at 70mph indicated im about 5mph faster per my wife pacing me... how do i correct the speedo/odometer?

 

[97ranger4x4]

You need to replace a little gear next to the transmission. if you go under the tech library. Click me.

That should help you out. BTW I have a 97 4.0 with 31x10.5 and it sounds like we have similar driving habits. I get around 280-300 mi/tank. That usually takes 18.1 or so gal. to fill up. I also do a lot of stop and go driving and for shorter periods. Usually 10-15 min at a time.

-Keith

 

[medicbearusaf]

sounds like the odo is sayin im gettin 220 ave but realisticly im gettin around 245 which is still way lower than i should be gettin

 

[97ranger4x4]

Yeh according to my tire size I am acctually getting around 320ish/tank. I also keep my OD off except when I am over 55 mph and that seems to help keeping the RPMs in a happy place so the truck isnt always shifting. Because it loves to slip into OD when i am doing 45-55

 

[MAKG]

It amazes me how many people don't know how to measure fuel mileage.

Miles per TANK is irrelevant. Not only are there at least half a dozen different sizes for RBVs, but you don't REALLY drain anywhere near all of it out even if you let the engine stall.

Measure the amount of fuel you put IN.

 

[Broaner]

Amazes me as well. I run the same tires except with a 5spd. I multiply by 1.055 because 31's are 5.5% larger in rolling diameter. When measuring fuel econ its important to always stop filling at the same point. Normally I just stop when the nozzle shuts off. When I'm really keeping track I go to the same pump at the same station. I go like this:

(Miles indicated)(1.055)/(Gallons put in) My normal driving is 70% city 10 minute trips. I get as high as 18mpg in the summer and usually in the 16's in the winter.

 

[MAKG]

You know, for around $10, you can replace the speedometer drivegear and have the odometer be correct.... 5% is quite close to one tooth.

Quite literally, it's $10-$20 and about 45 seconds.

 

[medicbearusaf]

ok well i filled up today at 225 miles it took 18.3 gallons thats 12.29 mpg... YUCK!! May be time to get rid of the ranger for now...

 

[Thumper113]

ok well i filled up today at 225 miles it took 18.3 gallons thats 12.29 mpg... YUCK!! May be time to get rid of the ranger for now...

Yeah, that sucks alright. It may be time to fix it instead of getting rid of it.

How are the..../....what kind of shape are they in?...........

oxygen sensors?
air filter?
maf sensor?
spark plugs?
plug wires?
etc?

And most importantly...............Do you floor the pedal alot under 2500 rpm's?

I filled up yesterday & it took 18.1 gal with 302 miles (yes, I made my speedo accurate since I have 5.13's & 36" bias ply tires) on the trip meter since the previous fill up, combined highway & city driving. If my 4.0 is getting better than yours (assuming you are figuring your gas mileage correctly), something's wrong that needs attention or your driving habits might need to be adjusted.

 

[medicbearusaf]

new k&n air filter 6 months ago,
new plugs and wires 8 months ago,
cleaned the maf 7 months ago,
not sure about the o2 sensors..

I did regularly keep it around 3k was gettin a lil over 200 miles, then toned my driving down and and watched the jack rabbit starts only gained about 30miles doing that.... last time i checked i wasnt throwing any o2 sensor codes.. someone at work suggested a may have a injector thats bad or not workin right...

 

[dmanmccann]

I measure my fuel every tiem i fill up which is every 4-5 days...I drive a lot of interstate..ohh..I have a 99 ranger 4.0 reg cab..My book says i have a 16.5 gallon tank..ive ran her down to the fuel light and only put 13 gals in her...anyway usually drive 7-8 miles to college (NOT HIGH SCHOOL) and back then to work which is exactly 20 miles there and 20 miles back every day so thats almost 60 miles a day not including going out, i drive a day...DAMN.. I average about 17-18 mpg if im figureing right and i have stock everything including tires not 31s yet many mods on the way.....thought id put my 2 cents in....

 

[Broaner]

I did regularly keep it around 3k was gettin a lil over 200 miles, then toned my driving down and and watched the jack rabbit starts only gained about 30miles doing that.... last time i checked i wasnt throwing any o2 sensor codes.. someone at work suggested a may have a injector thats bad or not workin right...

You're still refering to a pisspoor way to measure fuel econ.

 

[dmanmccann]

well then tell me exactly how to do it since my method is so piss poor