MPG test run

Filled her up, ran downtown and back in mixed driving ... 32 miles per google maps ... Filled up again at the same exact pump. 1.713 gallons ... 18.68 MPG!!

Does that sound right for a 66 CJ5?V6? Was better than I expected.

 

Assuming all speeds were below 55 I think it's possible with a good running v6


Last time I checked I got 14 but that was 2wd and fire roads


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thats pretty good . Im not real good at figuring my milege but last time i think i got about 15 . What id like to do is fit an electric or even a gas motor to the pto output. like a hybrid lol maybe a golf cart motor and another alternator or two to charge the batteries. except it would only be like its working in 3rd gear. not much room under the jeep to work with either. maybe ill just stick to turning the jeep off and coasting downhills

 

I had a 71 with a 390 holley model 8007 carb on it's 225 and 3.73 gears with a T98 that got 18 pretty easy. The wife's Jeep same running gear with an auto trans only gets 10.

 

I get 12 on a poorly tuned barely timed v6.

 

18 mpg is way better than my 2.5L YJ. So much for progress.

 

I was expecting 12-15, so was pleasantly surprised. Pretty small sample ... Hard to test when you have no odo ...

 

My 69 Commando V6 will get 17 MPG doing combined miles (3.73 gears)
My 3B, V6, 5.38's with OD only gets about 15 MPG.
The Commando has a bit over 80 K on it. The 3B motor is at about 186 K. The mileage on the motors could be part of the diffference in gas useage.
If it's a 25% OD on the 3B, the final drive ratio is 4.04 or so, it explains some of this.

 

By the way, t86, no OD, 3.73 in the axles.

 

My speedo is off because of my tire size, but I get VERY good mileage when I pop it into overdrive & get on the highway. 373 gearing.

 

"My speedo is off because of my tire size"

Try a GPS unit.

 

I have a speedhut gps speedo on order ... Will post when I get it installed.

 

I got 19.5 MPG on my 58 CJ5 with its kinda tired F-head (100 - 105 PSI compression with fresh rings ... yay?) driving the 5.38 axles and 31.7" tires (and the rear is welded to boot.) That was a 50/50 blend of city/highway driving and a 500 ft elevation change (down, and then back up.) I tracked it using my cellphone's GPS.

I was pretty floored. Once I get the transmission and transfer case rebuilt and install the Warn OD that's sitting on my workbench ... I actually think I could improve that by quite a bit.

 

Ok here's my input on this subject my 71 has only average 12MPG. V6 +3:73 . been that way since I bought it . they weren't too worried about MPG back then . 4WD vehicle , now just as a comparison . I have a 88 ford ranger 4X4 with a 4speed auto 3:73 . 2.9 FI . and that's average is 14 MPG . factory shows the average to be 14-18 . and I mostly drive it around town .

 

MPG? When it need's go juice, I fill it up. If ya worry 'bout MPG, ya don't need ta be drivin' ah JEEP!

 

My '69 CJ5 w/ 225 v6 / 4.88's in it's current state gets the best mileage of any of my vehicles.

Of course, it doesn't run, motor is in the shed, transmission and transfer case in garage;

so it's either pushed, towed or pulled on a trailer - so it uses NO fuel...