Steps to improve Fuel economy -
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post #1 of 3 Old 11-05-2002, 10:17 AM Thread Starter
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Exclamation Steps to improve Fuel economy


I am new to this boards and to jeeps as well. I just purchased a 84 cj7. I love it so far. I want to know how I can improve my gas mileage. This jeep is basically stock except most of the emissions control goodies have been bypassed. From what I have read so far on this forum the two major enhancments come from a new carb, like the weber K551. And a high out put ignition system.
Anything else? I sure there have to be some more tricks to get more performance out of the 258 engne. My tire size is only 30 in. I am currently getting about 11- 14 mpg mostly city driving.
I am fine with the amount of power the egine has and just want to make it a bit more economical since this is now my daily driver.
I have starving college student syndrome so cash is definetly an issue in any upgrade I persue.


Tim R.
Miami, Fl

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post #2 of 3 Old 11-05-2002, 10:26 AM
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Hey Tim, I'm in Miami also, but expect to be heading out within a week or so (construction project down here over the past few months winding down). Regarding your question, I have the same 258 and with the Carter carb and no emissions, the best I could squeeze was about 12-13 mpg around town, and 15 on the highway. Upgrading to the weber got me around 15 in the city and 18 on the highway, although with the freeway traffic down here it suffers! You'll appreciate the power of the weber, especially when you floor it and the secondary kicks in. Check this site for some deals on the K551 if you're interested.

Otherwise, not much you can do. I run my tires at 30 psi to minimize resistance, but that's all I can think of.

Currently an '86 CJ-7 and a '77 CJ-7 Golden Eagle---#4 and 5 following a '01 Sahara, '90 Sahara, and '85 CJ-7....
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post #3 of 3 Old 11-05-2002, 01:42 PM
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Aside from really firm tires, an open-element air filter and low backpressure exhust are two ways to go. But a full tune up is often over looked. Make sure everything (in the engine) is working like it should be, and little stuff like PCV valves, 02 sensor, and your cat are all clean and free of obstructions.

That being said, for city driving, don't expect too much more (with the stock set up)

Good luck and welcome to the "hands on" world of owning a CJ

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