How did you do it?? MPG bragging rights!!

[christopher]

well i'm getting 9 mpg, 304, 4.09 gears, close ratio t-18, 36 super swampers......how i did it, d&c lift(great), iroks and a lead foot, pretty good if you ask me.........let the greenies worry about saving the planet i just want to wheel!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

[Aaron Snare]

I have a 72 SII with a 304 2300 carb, close ratio 4 speed, 31 tires, 3.73 gears 4wd and I get a solid 18mpg on the highway at 70mph, about 14 in town.

 

[rbelflower]

I have a 76 Scout II, 345, Auto, 30" tires, 3.54 gears and get about 11-12 going back and forth from work. I have to drive up and down a large hill.. about 1500' difference in altitude in a very short distance.. maybe 5-10 miles OUCH!!
Without the hill I get an average of 14MPG... when I had my Rubicon, I got an average of 15MPG. The best I ever got in my J**p, was 19MPG, doing 55MPH with myself and 1 suitcase and a tailwind.

 

[Chrispucci]

14.5 mpg.

Scout II, 304, TBI Fuel injection, runs like a champ, T-19, 36" IROK's, Chevy Full Width axles, lots of trail mods, Cruising at 62 mph on the freeway full of camping camping gear.

Hand calculated mileage over 400 miles.

 

[larboc]

19.6 MPG odo corrected

averaging 55 through a few long hills. tuned GM TBI with knock

31" Tires, 3.31 gears, t19 wide, good shape stock 345. worn out front end.

oh, and it hauls.

 

[StefanM]

'72 with 31", 3.31, 4 speed, 1 barrel Holley, and 258 engine. I was getting 14-15 mpg with a bad vacuum advance. Put in a electronic Motorcraft dizzy from a Jeep and did the Nutter bypass. It's running super smooth now and getting just over 19 mpg at 55-60 mph.

I got a few other ideas to try and hope to raise that number a little.4

 

[Cory Smith]

24-27 mpg on the highway
20-22 mpg in town
15-20 mpg towing

 

[larboc]

24-27 mpg on the highway
20-22 mpg in town
15-20 mpg towing

"4bt"

Cheater.

 

[Scott Sinner]

I regularly tick off 6-9 mpg...

1970 800, 345 FI with a stock GM TBI chip. 727 SII auto 3.73 gears, 35 12.5 x 15 Swampers, no speedo correction (40mph on speedo = 48 mph on GPS). With speedo correction, I must be around 7.2 - 9.9 mpg.

But its still too much fun, and not my Daily Driver...

 

[tntmo]

Some people get some pretty decent figures here, better than I expected.

My 1970 800A with 232 AMC "Thriftmaster" gets about 12mpg.

The 1968 800 with 455 Oldsmobile, TH400 and 35's gets I don't care to check. I just put gas in it when it needs it, it's for fun only.

 

[steve graham]

1980 ScoutII Diesel,
Replaced the SD33T with a Cummins 4BT
Replaced the T19 With a NV4500
Kept the 3.73 gears,
Upped the tire size to 33/10.50/15

23-28 mpg or $.16-$.13 per mile for fuel. $3.88 gal today.
I have had as high as 35 mpg if I keep is below 50 mph.

 

[bmax65]

1968 1100 "Barn Door" 4x4 Travelall
BG 241
T-98, NP 202, 4.09 Dana 44's F/R
31x10.50s

6-8mpg in town, 10-ish on freeway at 55mph 'indicated' top speed...while driving it like a stereotypical granny in the slow lane...downhill. OPEC loves my truck!

Thirstiest engine I've ever owned. But with some time, money, and attention to math (gear ratios/rpm/tire sizing) hope to improve this situation. Might even contemplate a diesel swap.

Despite its' being a chronic gasoholic- looking at it reminds me of my dad, being a kid (with him in the IH showroom), and of happier times. Hard to put a price on that.

 

[Special Ed]

Went from 6 to 11, when I added the overdive.

 

[DHardy]

1980 SD33T Terra, 3:54 axle, 31X10.50 tires, 4 sp transmission, air cond. on. 23 mpg at 65mph.

 

[CareyWeber]

Over the course of one year I carefully checked my MPG. When I avg'd the year out I threw out the highest and the lowest and got an average of 24 MPG over a year. My highest was 28 MPG and the lowest was 19 MPG. See my sig for rig details, but think diesel.

 

[Paul Morgan]

We made 20+ going 60 all day in a 1980 Nissan Diesel Scout II
It really didn't want to go much faster

 

[StefanM]

Just updating:

Drove 476 miles over the past 5 days. Averaged 19.58 mpg. Mostly highway with a few small towns each day(4-5 stop lights/signs per town).

'72 Scout 258 engine, 4 speed, 3.31, and 31"

 

[Dan Phariss]

Thanks for posting up guys!!! Any FI 345 or 392 out there with anything MPG.. I may stay 345 or back to 400 Pontiac that motor was a H*** of a truck motor and I have a few more after market options.. But I don't have one anymore and the cost of motor bell and tranny to say nothing of more work to install I may stay 345.. Since I'm a engine machinist the work would be the same on any motor... It is of my Basic opinion that a major MPG build vs performance is cam selection and yes I'm shooting for MPG I would love to stay IH This motor will end up in my other post 120 to 1200 to 1300 ---- all B series it is coming along as well as wallet will allow 120 is down to frame- running gear 4 in lift 1/2 way done aprox 2 year project KEEP your post coming thanks again

Hell of a truck motor?
Did you put it in an actual truck?
Sorry but I remember my uncle putting a Ponitac v-8 into a F-6 Ford about 1963-64 to replace the flathead. He ran it for awhile but put the flathead back in since it outperformed the Pontiac engine on 1/2 or less HP in that application. The car motor had no low end torque.

Dan

 

[70binderPA]

i know it isn't an International, but my '05 subaru wrx, stock from factory, never got above 24.3mpg regardless of what i did. turbo-back 3" exhaust, a cone style air filter to replace the stock fiasco setup, and a retune of the computer and my best to date is 32.2mpg @ 70mph, windows somewhat down. i'd say that's a hell of an increase, not bad for a high 13 second car!

 

[steve graham]

Re: How did you do it?? MPG bragging rights!! UPDATE

1980 ScoutII Diesel,
Replaced the SD33T with a Cummins 4BT
Replaced the T19 With a NV4500
Kept the 3.73 gears,
Upped the tire size to 33/10.50/15

Camping trip up to the Chirichaua mountains, Scout was loaded somewhat, did not spare the throttle. 70-75 mph, averaged 20.78 mpg for the trip.