35's 4:88's 14 mpg

ccflexj · Feb 19, 2008

IS this normal for a Xj with a 4.0 35's 4:88s for highway mileage?

The jeep and motor have 105000 miles on it, just replaced rotor cap plug wires and fuel filter.

Driving 65-70 mph at around 2750 RPMs i get an average of 14 mpg

Thanks for any help.

tayman · Feb 19, 2008

that's kinda high rpm's for getting good mileage... My guess would be that that's your problem.

xalexjx · Feb 19, 2008

that sounds about right, my brother runs 3200rpms on the highway with 5:38's and 33's

ZacSquatch · Feb 19, 2008

xalexjx said:
that sounds about right, my brother runs 3200rpms on the highway with 5:38's and 33's

....He have a 5spd, 4 banger or just drives in town a lot..

NighthawkXJ · Feb 19, 2008

i have 4.56s with 33s and i get 14mpg on a good day, and about 13.5 most days. sounds about right to me.

x2elite · Feb 20, 2008

I have 4.10s on 35's and I get around 18-19 on the hwy.

lancey3 · Feb 20, 2008

235s and 3.55s i get 20 on the highway.

tayman · Feb 20, 2008

x2elite said:
I have 4.10s on 35's and I get around 18-19 on the hwy.

....and that just confirmed my guess.

Starscream · Feb 20, 2008

lancey3 said:
235s and 3.55s i get 20 on the highway.

Okay, great.

Ya, you're not really going to get good mileage with 35s no matter the gearing. 18-19 on the highway with 4.10s seems like a stretch, but whatever.

libtech · Feb 20, 2008

3.55,31/10.5 = 15 mpg in colorado

old_man · Feb 20, 2008

4.56's on 35 with a 4.7L stroker = 21mpg here in Colorado

tayman · Feb 20, 2008

3.55,31/10.5 = 15 mpg in colorado

lol. I have 3.07's and 31x10.5's and get the same.

libtech · Feb 20, 2008

old_man said:
4.56's on 35 with a 4.7L stroker = 21mpg here in Colorado

wow. I cant wait for my tune up kit to come, maybe its time to replace my o2 sensor.

Stumpalump · Feb 20, 2008

35x13.50 4:88 gears 14mpg in Colorado.

mecompco · Feb 20, 2008

33x10.5s, 4.56s, 180K miles, 14 MPG.

ROBZ95Xj · Feb 20, 2008

how many who are posting numbers have actually recalirated there speedo?

Locked-up-XJ · Feb 20, 2008

35" 4.56 4.0 and i get 17-20 mix of around town and Highway

RyanM · Feb 20, 2008

Yeah, If your speedo is pegged when your cruising on the highway with traffic, your gears are too low and you are getting way higher numbers

I get like 17mpg highway. 36x12.50 radial, 4.88, ax15. 15 mpg mall crawling.

mecompco · Feb 20, 2008

ROBZ95Xj said:
how many who are posting numbers have actually recalirated there speedo?

My numbers are per the GPS, so should be accurate.

xalexjx · Feb 20, 2008

ZacSquatch said:
....He have a 5spd, 4 banger or just drives in town a lot..

Not his dd, anything over 30 miles and he puts it on my trailer, he has a tera flex 4:1 too so crawling on the trails he runs 2-3 gear first gear it hardly moves

edit: its a 4cyl 5 speed to.. gets up to 75 fast but there its almost on the rev limiter. With narrowed d44's front and rear, he also runs 33 spline (rear) and 30 spline (front) and ox lockers he can hold it off the rev limiter on just about anything and not have to worry about breaking stuff. Im trying to get him to squeeze some 37" boggers in there and some bead locks... the 33's are small but he holds his own.

35's 4:88's 14 mpg

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