Narbu

I have a
year: 96
mileage: 83,173
tire size: 31-10.5
driving style: city
aftermarket: intake
city/highway ratio 12/16

XJs-R-us

year: '89
mileage: 186,xxx
tire size: 33's
driving style: light footed as f***! ...Except offroad
aftermarket: ???...in sig...
city/highway ratio: I completely stay off the highway! Its a pig on there.

Im guessing I get around 10-12 mpg's or less...
It takes an 1/8 tank to drive the 15 or so, miles home.

tetongravity

99 4.0 35inch mtr's 4.56 gears and 8inch full traction lift...dana44 rear, dana 30 front with dana44 outers & warn locking hubs, motor has bored out throttle body and banks header/exhuast....it has 189K miles I get 8-9mpg both in town and on the highway....

good thing its paid for....I pray for gas prices to stay low....

snowmonsterdude

Year: 1998
Mileage:113k
tire size:245/70/R17
Driving style: i generally drive the speed limit (maybe sometimes like 5 under to be safe)
Aftermarket: tail lights, K&N cold air intake, flowmaster 40
Gas mileage: i get like 10 no matter where or how i drive... i dont drive on the highway much either

SHO_91

Your factory tire size is 27.7", so with 31" tires, your speedo/odo is off by 11.9%, with 33", it's off by 19.13%.
So, if you get 210 mi on 31s, you get 1/8 less, or, 12.5% (close enough, add a little loss for heavier tires), but on 33s, you say, you get 170 mi, which is 70 mi less, or, 29.16% - which is 10% more than the speedo/odo error. From that, I'd say, 31s are not too hard on mpg, but 33s definitely are.

s14unimog

terrible

/thread

troy fritz

Was getting 7.1 . I changed the wheel hubs and getting 11.71 now. Thats a big improvement.

truckntractorhick

yikes, readin this makes me scared to lift!

Tural

don't be. i have 4.5" lift and 31s and i'm moving up to 24mpg. but i drive like a deadman. i wait for the wind to pull me forward.
after this weekend, here's my list of aftermarkets. new headers, cut out the indentation on the factory downpipe by the flange, "INSTALLED" a "HIGH FLOW" cat (if you know what i mean), flowmaster 40, K&N air filter, new champion copper plugs, intake manifold and head ports cleaned spotless, cleaned the injectors spotless, Hypertech Max Energy, i think that's it. oh, and this week i'm gonna get a bored out TB, 4-hole injectors, and next week i'm gonna get a new fuel filter, and a plug wire-cap-rotor combo. that was a handfull huh?

posjeepxj

Good boy. I figure 7% loss for every inch the tire gets wider. it works for most applications.

I got a 4.10 front waiting to go in but havent got my 8.8 ready yet. Hopefully i will get a little better with 4.10s but doubt to much.

XJs-R-us

!!!!!!!!!!!!!!!!!!!!!!!!

SHO_91

Yeah I have my moments (good & bad)

posjeepxj

Im actually getting an average of 185m per tank now with my 33s. Took the mech fan off and put an electric on. Took the constant rotating mass off. when the electric fan runs there is more drag on the alt but if i stay over 20mph it almost never kicks on.

Highley recomended mod (need beefy alt also)

SHO_91

Ok, so 185 mi is 55 less than factory, which is 22.91%. That's only about 3.8% over the speedo/odo error. Not bad. I am considering the electric fan, too, since people tell me it's at least 5% power-parasitic. On a side note, does the elec. fan come with a sensor that kicks in at the appropriate temp?

posjeepxj

i love it but havent tested it in any weather over 60. You living in az done know how much of a differnce in mpgs it will give you (it gets hot there). but inmost cases in increase cooling and you can feel a little power difference. Just remember the higher the amp draw from fan the more the alt will drag.

I originally was tring to go taurus e-fan but had way way to big of amp draw for my liking