I ran stock gears in my old ZJ on 35 SSRs I got over 10mpg ...lol...I run 5.13s with 40 Boggers , which with the XJ weighing nearly 6k and the boggers having much more rolling resistance than other 40s those 5.13s are worse than stock gears like 3.55s and a typical road friendly 35 with an auto trans ...and I'm still getting about 10mg average , so 5-6 mpg seems a bit off or you have other issue besides gearing ...lol...like a hole in the tank .

 

Been having an issue for over a year. I've tried everything anyone ever suggested on here short or gearing. If I can get 12 mpg ill be happy. Haha.

 

did you change your speedo gear? your reading is inaccurate if you havent changed that
seth

 

I think it was changed for 32's. how much is a speedo gear?

 

Did you physically calculate your mileage when you fill up?

 

Even that is gonna be off cause your miles traveled on the dash will be lower than what you actually traveled. I'm only on 31s, and I calculate about 14.5- 15 around town, so I estimate I'm really getting 15-15.5 in reality. Which is really good(I think). But I also have 3.07s.

 

Cracked exhaust manifold will also kill your mileage. Ask me how I know lol.

 

It will be within about 10% though. If he's getting 12 calculating it this way, it would technically be 13, which isn't much better. I get around 13 highway with 4.88s and 33s which is cruising at about 80. I suspect if I was going slower, like 55, it would do better because the rpms would be much lower.

 

And aerodynamics or lack thereof and rolling resistance isn't fighting you as much. I can get 15 crusing in the mountains 45-55 even up hills but less on the highway at 65, even worse at 75

 

Picked up a Hobart 190 yesterday also another beautiful Colorado sunset

 

Did you buy it new? I want one of those.

 

have some 31 1050 15 tires up for sale. asking 20 bucks each or 60 for all 4. if anyone knows a person needing tires or rollers or spares. pm your number and can send pics

 

WHERE in Colorado?

 

Yes new haha

 

What is the average cost to have a transfer case (np231) rebuilt ? I think my chain is pretty stretched. I can do without loosing my DD.