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Old 02-09-2007, 03:44 PM   #1
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better gas mileage, How to do it?

my girl has a 2000 wrangler, lifted sitting on 33" tires, 4cyl. and she is wondering if there is anything you can do to make the gas mileage better? it already has the aftermarket air intake with the K&N filter on it. can you put electric fans on it, pullies, what do you do to jeeps??

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Old 02-09-2007, 04:00 PM   #2
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Only drive downhill helps ALOT!!!


Sorry, had to be a smart a**. Regear the differentials and you will get some of your economy back. Assuming you have 4.10's in there, you should probably go to 4.56's. That will help with both power and economy.

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Old 02-09-2007, 04:17 PM   #3
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I know some will disagree but I noticed an improvement in gas mileage when I installed a throttle body spacer on mine
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Old 02-09-2007, 04:37 PM   #4
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I noticed a improvement with my e fan, jeeps just suck for gas mileage
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Old 02-09-2007, 05:44 PM   #5
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(seriously, $1600 got us a DD civic that nets around 38mpg on the highway)
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Old 02-09-2007, 06:32 PM   #6
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Quote:
Originally Posted by blkNyellow View Post
my girl has a 2000 wrangler, lifted sitting on 33" tires, 4cyl. and she is wondering if there is anything you can do to make the gas mileage better? it already has the aftermarket air intake with the K&N filter on it. can you put electric fans on it, pullies, what do you do to jeeps??
I'm afraid there is nothing you can do except drive it like you had an egg under the skinny pedal. Driving a Jeep is like driving a brick thru the wind. However, with a 4cyl and 33's, maybe regearing will help. Doing that depends on lots of things.
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Old 02-10-2007, 08:19 AM   #7
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As stated, your going to spend more in mod's to get a few mpg vs having the cash to buy gas or buy a beater ricer for good mpg.
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Old 02-10-2007, 09:04 AM   #8
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Keep it off the freeway, under 40mph and mine does pretty good actually.
Otherwise start looking for diesel engine to stuff in.
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Old 02-10-2007, 09:29 PM   #9
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Buy a Prius. Bump on 4.56's. A lot of things do a little but never enough to pay off, I've tried.
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Old 02-10-2007, 09:43 PM   #10
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no call me stupid but wouldn't 4:56's make the engine rev up higher thus using more gas?? I know it would make it get up and go a little better but wouldn't it suck on the highway b/c it would be rev'ing so high?
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Old 02-10-2007, 11:04 PM   #11
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Quote:
Originally Posted by blkNyellow View Post
no call me stupid but wouldn't 4:56's make the engine rev up higher thus using more gas?? I know it would make it get up and go a little better but wouldn't it suck on the highway b/c it would be rev'ing so high?
You beat me to it. I forgot to mention that in my post.
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Old 02-11-2007, 09:47 AM   #12
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every engine has good cruize speed. Sometimes for gas is better for the engine to be reving higher than to be strugling in low rpm with a lot of gas and the engine being pressed to the metal. On constant highway speed it might be somewhat different but i know this as a fact that an 4banger engine strugling at 1000 rpm to go with 50 mph will eat more gas than an engine thats cruizing good with 1500rpm at 50mph. Its similar to that 6 vs 4 banger theory. Using 4 banger to pass a car can eat more gas than using a v6 to pass a car. You gotta step on that 4 quite a bit to get the same output the 6 will give you when its not that press there fore will eat more gas. Thats why many people with 4 banger wranglers get similar mpg that i get with my 6.

As an advice i can only say drive like you are driving a cup full of water on your dash that can spill under the weakest G force change.

I'm wondering something my self cant you replace the camgears with adjustable so you can adjust the camshaft gears to get better mpg though. I've seen people do it on my previews car (miata) if they spin the gears to get better torque but loose hp they mpg also goes down.. if they spin the gears to get better hp but loose torque they get better mpg. I wonder if it will work for jeeps
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Old 02-11-2007, 11:23 AM   #13
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I've got the TBS, and the CAI, and noticed a slight increase (2mpg not really enough to justify them), but the best increase in mileage I get is when I drive without my foot in the floor. Best I have ever gotten was around 21mpg (at around 2k RPM) on the highways and as I mentioned in a post a while ago I got around 30mpg running along the Texas/Mexico border at 35 to 40 MPH in 5th gear (alot of coasting involved).

I like the diesel idea myself. Imagine the torque
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Old 02-11-2007, 01:15 PM   #14
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Because of larger tires your RPM at any speed is now lower than stock. An engine that strains uses more fuel. I can't help you on a 4 banger, but a six has a sweet spot around 2400 RPMs at 60 MPH. There it gets the best mileage, or mine does with 4:88's and 35 in. tires.

Changing the ratios would bump up the RPMs back to stock for the best mileage. Four cylinder Jeeps are fine Jeeps. Off road they are good. It's just that most people re-gear after going to 33's.
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Old 02-11-2007, 02:43 PM   #15
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that was my thought. Shouldn't they be going 'down' to something?
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Old 02-11-2007, 02:46 PM   #16
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trailguide what is your average rpm you drive your jeep on in the city areas? What rpm do you shift on?
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Old 02-11-2007, 10:27 PM   #17
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I know most people don't believe in the Tornado but I have had mine on several cars and trucks and it has helped my 04 X with manual trans with 31's on it.
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Old 02-11-2007, 10:38 PM   #18
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04x68bronc what difference are you getting?
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Old 02-11-2007, 10:44 PM   #19
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Not sure of had I will have to calculate the mileage. Its the girlfriends and she drives 30 miles a day x 5 and uses about lil over half a tank in stop and go traffic. I was from NW Indiana up until 2 years ago. I lived in South Holland till I was 6.
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Old 02-11-2007, 11:04 PM   #20
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if your calculating your mileage running 33s and have not changed speed O gear/sensor then your mileage isnt as bad as it seems?!
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Old 02-11-2007, 11:59 PM   #21
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yep as Jeeperx2 says thats another important thing you gotta take into advantage.. Your stock trip meter changes quite a bit when you kick up your tires few inches.
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Old 02-12-2007, 09:16 AM   #22
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Do regular tune-ups once a year and make sure you check your tire pressure once a month. I started doing this last year and noticed i get about 3-5 miles extra per gallon (averagin bout 19 20 mpg now). My brother runs his aired down for trails and is only getting 11-14 mpg. Keeping your jeep properly tuned and aired is the best way to save on gas.

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