MPG estimates done here!

Going through the old threads I noticed the MPG claims on early CJs ranged from 8 to 15 MPG.

Now I realize there are so many varibles that affect MPG, but the two major ones would be engine size and tiresize/axle ratios. I wonder if some of you would be kind enough to "guesstimate" what kind of MPG you get and what kind of engine/tire size you have on your rig?

Thanks.

 

I get 12-13 mpg via easy cruising along the freeway, and that's with 3.73 gearing ('71) and 33"ers going 70mph. My 225's been recently rebuilt tho.

 

Mine was between 15-16 on the rural 2 lane highways when I used it as a daily driver, I have actually on a few rare occasions gotten a little over 17 don't know how, must have been a good tail wind going both to and from work on those few days. I drove it 50-55 mph for a 10 mile trip one way 5 days a week for about 1 1/2 years, I got this kind of mileage with way over 140k miles on the motor. I decided to rebuild my v6 after 166k miles when it started loosing power all of a sudden and would not run after about 20 minutes of straight driving.
I have 3.73 gears and run 31x10.5 mud tires. My engine is currently being rebuilt, will let you know what it gets when its rebuilt and broke in.

 

In the CJ (F134 engine, Pertronix ignition, 30" bias ply mud tires, 4.27 axles) I got 14 with the old Carter, now I get 17+ with the Solex. Only get 8 in the M715 right now.

Stan

 

Percival, equipped with 5.38s and the Warn overdrive ranges between almost 16 to as high as a little over 20 MPG. It's got the stock f-head, with a Carter YF carb, and the skinny G78-15 tires.

I've heard a lot of horror stories about poor fuel mileage, and while everyone wants more, based on what I'm hearing, I'm pleased with what I'm getting. I am thinking about getting 16 wheels, and tires in the 215/85/16 range - I know this will drop my RPMS on the highway, but does anyone know from experience what it will do to my mileage?

Eck

 

61 cj5 with 225, 31's and 5.38's, about 11-12

60 Willys pickup with 226, 31's and unknown gearing, about 12-13.

 

'53 M38-A1, Buick 231 V-6, 15 gallon 1975 (?) CJ gas tank, 235-75-15's and I have no idea what my milage is. My sending unit doesn't work with my gas gauge, so I keep a 5 gallon jerry can on the back..

DOndo

 

I haven't checked it for about a year or so, but my V6 would get 16-18 going 50-55 mph. That's with 3.73's and 31" tires. Engine is all stock with points and 2G carb. Although, I do baby it quite a bit.

 

I am at 10-13 mpg with a heavy foot, 225 V6 (2G carb, HEI), ~32x9.25's, 4.88's. Doesn't matter if in town or on the highway. If I turn my AC off it does a little better

 

I get 14 mpg with 225, 5.38s, 31x10.50s and Warn OD
(if I keep it under 66 mph)
any faster, and the RPMs go to 3200-3400 and mileage suffers

 

'70 Jeepster
225 w/ 2G and points
247,000 miles
3.73's
235/75-15 (28")
No OD

Best ever 20mpg (50,000 miles ago)
Worst 13
Average 15-17
(When it drops to 14 I throw in a new set of plugs and it jumps back up to 17+ for the first couple tanks. I really need to overhaul that 231 and put it in )

 

I'm not good with math but I just drove 1000 miles with a 10.5 gallon tank and it only cost me about 120$ this being CA 2.15$ minimum gallon of gas

 

225 v6

 

my speedo hasnt orked till recently, but i would have to guess around 12-14 w/ 225 and 33's

 

Oh, you mean zip up your windows, Right!!

 

Built Chevy 283
4 barrel carb
Warn OD
3.73's
31x10.50's
12-18 mpg depending on how hard I step on the loud pedal

 

32" Tires
3.73's
V6 with Rochester 2G

I consistently get 13-14 MPG around town.

 

With 5.38's and 33" tires, I get 10 to 12 around town. Usually 12 or so.