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Gas mileage tips


Blue88Comanche
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19-21 is good. It can do better if you alter your driving habits. Do a search for "hypermiling" or "hyper-mileage". I don't back up all of their methods like minimal braking around corners, etc. But this stuff works. When I worked in CO I'd coast down 6 miles of mountain road with the engine off every morning at 4 am. Turned my 23 mile commute into 17 miles. I could only do that because there wasn't other cars on the road at that time. I'd never do that in traffic.

 

http://www.gasolinecreditcards.com/ecot ... resources/

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Gas mileage will vary heavily depending on the season. In the winter I can barely muster up 17-18MPG on the highway with my '01XJ. In the summer, that same Cherokee will get 20-21MPG (with A/C off). You're not going to be able to make our bricks more aerodynamic so that really limits good fuel mileage to driving habits. I have found that if I keep my XJ in the 65-70MPH range on the highway, I will net better fuel mileage than if I stay in the 70-75MPH range - most likely has to do with the RPM I'm running at and where our 4.0L engines are their most efficient.

 

Something else I've tried, but haven't really seen noticeable results, is to air up your tires a few PSI more than the recommended amount.

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4.6 Hesco stroker, AW4, 31" tires, 4.09 gears.

 

The Good: On a long trip, it drones down the Interstate at 75MPH / 2500RPM happy as hell and delivers 21MPG minimum, most of the time closer to 23MPG depending on the weather.

 

The Bad: Around town, which is at least 75% of it's use, careful or not w. the skinny pedal, best possible is 15MPG, but usually it's 13MPG. And have been recording MPG for almost five years now. So screw it, I'm not careful w. the skinny pedal anymore and enjoy it locally. :cheers:

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Just filled up the ZJ today. 5800 LB wet with 30's a 4.0L. With my grandpa driving style, liberal use of cruise, and coasting, I have a confirmed mileage of 20.26 MPG for the 414 miles I got out of that tank before filling... 100 miles of that was with trailer.

 

Rob :D

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Just filled up the ZJ today. 5800 LB wet with 30's a 4.0L. With my grandpa driving style, liberal use of cruise, and coasting, I have a confirmed mileage of 20.26 MPG for the 414 miles I got out of that tank before filling... 100 miles of that was with trailer.

 

Rob :D

 

20.26 MPG confirmed on one tank of gas. Freaking amazing! jamminz.gif Ever check indicated vs. GPS? Just curious.................

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I use the same pump every time I fill, only fill until it clicks off, no topping off. Then I use the amount filled vs the trip. I wish I could trust the average MPG calculator on the over head console, but I don't. Simple math it is.

 

I do watch the instant MPG though to keep my driving habits in line.

 

Rob

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In my opinion and first hand experince the best things would be

- Look at your gears to see if they are correct for your tire size and if not re-gear

- Electric Fan swap to get rid of the Mechanical fan

- Open element filter and better flowing exhaust

- Hub Conversion IF you do not already have the Vacum actuator

- Synthetic fluids

- Tonneau cover for us MJ guys

- Mid grade fuel

- Vacum guage so you can monitor your driving

 

My MJ with a slightly moded 4.0L (but nothing major) and the electric fan, AW4, 3:73 gears and 31x10.5x15 tires

gets around 15L per 100KM (15MPG) city and I am not nice with it, I do not drive all that much with it on the highway so I will have to look that up next time I am on a Road trip...

 

It will get much better once I get my 33's on as my gears are too tall for 31's and get around to installing my Hub conversion...

 

I find it soo funny when people make statements that the Jeep can not be good on fuel because it is a brick in the wind, Fuel mileage is what your make it and it can be great if you make the right changes and drive acordingly but most people do not spend the money in the right places especially once they have lifted the Jeep...

 

My Old CJ7 on 35's with the right amount of things done and the correct driving attitude I got around 600KM per tank (19MPG) so the brick in the wind is definately not a a good statement...

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not a highjack!

 

i am replacing my exhaust and the inside of the pipe is totallly black. everything is correct, so i'm going to try making the adjustable map sensor. its featured on two of my bookmarks. a friend of mine has good luck with his. anyway will post when i have more info. dave

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When I still had Booger, best ever mileage I managed to get was 22mpg. The new owner was putting 1000 miles a week on it between getting a job in Maryland and finally getting his house in Ohio sold, so he started fuel saving modifications, including different fuel injectors (from a Neon, I believe) and putting skinnier tires on it. He's going down the highway getting 26mpg now. That's in a 94 4.0HO.

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The math shows I get about 13.5 mpg which breaks down to about 70/30 city to highway driving. I do need to figure how to calculate my bigger tires though. I've got 31s on the truck, so I guess I'm actually getting about 14.5 or 15mpg. Not bad for me seeing as how my previous truck was a Chevy 3500. I'll take 14mpg over 6mpg any day.

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