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Old 03-02-2010, 03:07 PM   #1
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help with fuel economy upgrades

I was wondering if there are any good upgrades to to to my 99 tj that will save on the gas. like the throttle body spacer. Or are there any to stay away from. How about the chips?

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Old 03-02-2010, 03:15 PM   #2
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There are none that work, if they did the auto manufacturers would already use them. Don't believe anything you read about how well they work. All they want is your money. If you search this forum you will see many posts about this question.

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Old 03-02-2010, 03:27 PM   #3
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Buy 4 of those "space saver" spare tires that most passenger cars carry and mount them on all 4 corners of your jeep. That may be the only way to improve your gas mileage.
Best thing I ever did was find out before jeep ownership that the gas mileage sucked, and allow my desire to still want a jeep overrule the lack of practicality of my jeeps MPG.
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Old 03-02-2010, 03:50 PM   #4
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trade it in for one of these
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Old 03-02-2010, 04:36 PM   #5
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OH no I love the Jeep and if I can't get better gas millage then so be it. I would put up with worse millage if I had to. And as far as that micro I wouldn't drive that to a worm wrestle. I just thought, you guys, that know these Jeeps better than myself knew of something worthwhile to invest some money into then I would give it a shot. But is in no way a problem that out ways the fun.
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Old 03-02-2010, 04:48 PM   #6
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Best thing u can do is just be easy on the gas pedal. Don't floor it all the time, coast when u can, and keep the top speed down. You won't get no 30mpg, or 20, hell 15 mpg is awesome.

I traded in a Nissan that got about 30mpg for my Jeep. The way I see it, the lousy fuel economy is a small price to pay for such a cool vehicle
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Old 03-02-2010, 04:49 PM   #7
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jeeps tend to get more smiles per mile than miles per gallon
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Old 03-02-2010, 05:05 PM   #8
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I drove a YJ for 200K, it I wanted better gas mileage would I have bought a new TJ. Mine burns 5 gallons a day as my DD. Who cares, I have more fun than those Corolla drivers trying to squeak another MPG out of their rice burner.

Just have a good time and don't look back.
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Old 03-02-2010, 05:24 PM   #9
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You will often find that increasing power can help gas mileage as well...but it depends on the mods. Some will cause the engine to dump more gas which will be a reverse effect. Plus with an increase of power, you also have to keep your foot from taking advantage of it. Also, we're limited because our engines aren't necessarily inefficient, but our bodies just aren't very aerodynamic.

If I could find a way to pull 16 city, 20 highway...I'd be in heaven, since I'd get all the smiles...and the same gas mileage as my truck. lol
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Old 03-02-2010, 05:24 PM   #10
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I realized quickly that if I drive like an idiot, I get about 10-12. If I'm light on the pedal and no red light racing, I get around 14-15 and 18 on the highway.

Light pedal=good mileage.

off road mileage= who cares, the fun of having a jeep is worth all the gas !
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Old 03-02-2010, 05:34 PM   #11
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joe hit the nail on the head, drive it nice ande easy.

33s, 3.73s, 3speed auto. true flow air filter, fresh oil in everything and 14 to 17mpgs. about as good as it gets for me.
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Old 03-02-2010, 06:03 PM   #12
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When you have your Jeep geared properly, what's the optimum range for the best highway mileage in a Jeep? Anybody know?
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Old 03-02-2010, 07:32 PM   #13
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Get one with a 4 speed transmission and it will get better gas mileage, but it is still a Jeep.
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Old 03-03-2010, 06:20 AM   #14
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I'm getting 225 miles on a tank no matter how I drive. highway city it don't matter much.
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Old 03-03-2010, 05:15 PM   #15
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Well there is one rpoduct that might help.....A Vacuum gauge. When you accelrate try and keep it in the green and you will get the best mileage per gallon....The closer to RED the least mileage. If it's there you will watch it....I had one in another car and you'd be surprised how you watch it.
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Old 03-03-2010, 05:18 PM   #16
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In fact watch the vacuum gauge video
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Old 03-03-2010, 05:29 PM   #17
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I guess your trying to save on gas with a jeep... It can be done but with a big pocket of change... I'd say get a fiberglass tub would be a start..
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Old 03-03-2010, 06:29 PM   #18
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Here's the deal... Chrysler, Ford, GM, etc. are all under INTENSE pressure to up their average (fleet) mpg ratings. Every year, the Feds want better mpg ratings.

If there was any easy/cheap way to improve that mpg rating by even a smidgen, they'd be doing it to help keep the Feds off their necks. There is no Holy Grail part, chip, etc. that is going to up your mpg. The best you can do for your mpg is to keep your foot out of the gas, keep your tire air pressure up to where it should be, and keep your engine tuned and the air filter clean.
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Old 03-03-2010, 06:45 PM   #19
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and drive down hill as much as you can
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Old 03-03-2010, 07:04 PM   #20
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I was getting 20 mpg in town with my 91 with the 4cyl 5spd and 31. My TJ is the same with 33s and it dont get close to that.

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