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Building a Bumper?Ruffstuff Axle Simple Swap Kit!~Artec JK 1 TON SWAP~

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Unread 08-30-2011, 06:23 PM   #1
sublimesurfer
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fuel economy

Any tips on increasing my fuel economy on my 82 CJ7?

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Unread 08-30-2011, 06:30 PM   #2
Ken4444
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Common suggestions typically include:
  • Run smaller tires (same as, or closer to stock size)
  • Lose weight (winch, hard top, large bumpers, etc)
  • Use a stock suspension height (ie: no lift)
  • Use a transmission with a 5th gear
  • Be sure that your carburetor and ignition systems are running right
  • Keep the tire pressure to the maximum reccomended, or a few pounds more
edit..

There's also the issue of driving without a top verus a full top. I would think a hard top probably gives you less wind resistance, but clearly the weight of the top isn't going to help at all. Maybe a full soft top is the right balance.

Another item is lowering the elctrical load (lights, accessories, etc), but in the grand scheme of things it's probably not a huge factor.

Keep in mind the original MPG for CJs wasn't ever great to start with
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Unread 08-30-2011, 07:04 PM   #3
JeepsOLot
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Unread 08-30-2011, 08:20 PM   #4
benullman
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drive it nicely. Dont have your foot in it. Its not a race car. Shift smoothly and know how to drive a clutch correctly and you will be repaid. My buddy gets 19MPG with a weber 32/36 258/T176 33's 4" lift and full hard top/doors

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Unread 08-30-2011, 11:37 PM   #5
Rollbar
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It's like driving a brick. Put the windshield down

P.S. 258/4spd/d-300/carter bbd/ 31"tires/3:31 gears/new ign/new timing chain/new vapor canister/rebuilt carb timing @ 12* (due to elevation)/new copper plugs/ford cap/rotor/wires/coil/new fuel tank sender/new hoses......

Getting 15 to 16mpg running 90 octane

I do need to check Peaches air pressure.
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Unread 08-31-2011, 03:01 AM   #6
John Strenk
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Quote:
Originally Posted by Ken4444 View Post
Common suggestions typically include:
  • Run smaller tires (same as, or closer to stock size)
  • Lose weight (winch, hard top, large bumpers, etc)
  • Use a stock suspension height (ie: no lift)
  • Use a transmission with a 5th gear
  • Be sure that your carburetor and ignition systems are running right
  • Keep the tire pressure to the maximum reccomended, or a few pounds more
edit..

There's also the issue of driving without a top verus a full top. I would think a hard top probably gives you less wind resistance, but clearly the weight of the top isn't going to help at all. Maybe a full soft top is the right balance.

Another item is lowering the elctrical load (lights, accessories, etc), but in the grand scheme of things it's probably not a huge factor.

Keep in mind the original MPG for CJs wasn't ever great to start with
Also try
Passenger Car tires.
Electric cooling fan. (saves on HP lost with mechanical fan and only runs when needed. )
Synthetic lubrication in tranny and axles.
Slow Down.
Leave for work when traffic is least busy.
Don't idle long
Drive as soon as engine will pull jeep
Make sure choke is working. Fully open fast depending upon temp.
Run a water heated intake manifold.
Unlock hubs
Adjust brakes.
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Unread 08-31-2011, 03:17 AM   #7
John Strenk
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Quote:
Originally Posted by Ken4444 View Post
Common suggestions typically include:
  • Run smaller tires (same as, or closer to stock size)
  • Lose weight (winch, hard top, large bumpers, etc)
  • Use a stock suspension height (ie: no lift)
  • Use a transmission with a 5th gear
  • Be sure that your carburetor and ignition systems are running right
  • Keep the tire pressure to the maximum reccomended, or a few pounds more
edit..

There's also the issue of driving without a top verus a full top. I would think a hard top probably gives you less wind resistance, but clearly the weight of the top isn't going to help at all. Maybe a full soft top is the right balance.

Another item is lowering the elctrical load (lights, accessories, etc), but in the grand scheme of things it's probably not a huge factor.

Keep in mind the original MPG for CJs wasn't ever great to start with
Also try
Passenger Car tires.
Electric cooling fan. (saves on HP lost with mechanical fan and only runs when needed. )
Synthetic lubrication in tranny and axles.
Slow Down.
Leave for work when traffic is least busy.
Don't idle long
Drive as soon as engine will pull jeep
Make sure choke is working. Fully open fast depending upon temp.
Run a water heated intake manifold.
Unlock hubs
Adjust brakes.
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Unread 09-05-2011, 12:51 AM   #8
Astrodokk
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Posts: 181
Tow it behind an RV. Other than that, good luck! I've quit trying myself. I catch myself looking at the gas gauge like every few minutes to see how far the needle moved!
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Unread 09-05-2011, 06:08 PM   #9
yahwhy
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only drive downhill, in neutral with engine off
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Unread 09-05-2011, 06:21 PM   #10
CherryCj7
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I dont know what engine you have but when I put in my 4.3 I had more power and I get better gas mileage with my 31" M/T tires than with my 29" stock tires. I think the difference of 17 MPGs to 15 MPGs. So if you have a v-8 if you are running the stock size if you increase it reasonably you may get a little better... This is just through personal accounts, i am not even 100% sure about why this is. Hope this helps. - Vince
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Unread 09-05-2011, 07:19 PM   #11
BagusJeep
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Fill in your profile with all the info on your Jeep, anyone can then chime in with comments like 'those 37" swampers are not good for economy"
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Unread 09-05-2011, 07:20 PM   #12
BagusJeep
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If you have a 258ci mainly stock CJ7 with 31" maximum tyres you should see the high teens in highway driving at up to 60mph. Anything faster, larger etc. will suck the petrol
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1981 CJ7 258ci - Bagusjeep
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1981 J20 258ci - Gladys
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Unread 09-06-2011, 04:05 AM   #13
keith460
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Quote:
Originally Posted by yahwhy View Post
only drive downhill, in neutral with engine off
I did that once with my wife's 84 CJ-7 and almost crashed the Jeep on the guardrail. Forgot the steering wheel would lock if the key was turned to the off position. Yikes!

Never did that again....
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Unread 09-06-2011, 08:30 AM   #14
Cutlass327
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Quote:
Originally Posted by CherryCj7 View Post
I dont know what engine you have but when I put in my 4.3 I had more power and I get better gas mileage with my 31" M/T tires than with my 29" stock tires. I think the difference of 17 MPGs to 15 MPGs. So if you have a v-8 if you are running the stock size if you increase it reasonably you may get a little better... This is just through personal accounts, i am not even 100% sure about why this is. Hope this helps. - Vince
Was your speedo gears matched for the increase in tire size? If not, it will show fewer than actually traveled miles, not actual mileage, and this will make you think you have increased MPG.
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Unread 09-06-2011, 10:49 AM   #15
CherryCj7
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The gear was not replaced but i have compensated by adding 6 miles per 100 miles shown on the odometer.
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