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Want to improve gas mileage/performanc on 2000 Jeep Cherokee


 
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BrendonW
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Joined: 18 Jul 2006
Location: Oklahoma City

PostPosted: Tue Jul 18, 2006 10:41 pm    Post subject: Want to improve gas mileage/performanc on 2000 Jeep Cherokee Reply with quote

Hey all. New here and don't know a whole lot about engine modding. I have a 2000 Jeep Cherokee (2wd Sad and it's a 4L) and I'd like to know if there any ways to get some better performance and gas mileage out of it. I have been driving lighter lately but it doesn't seem to help with my gas mileage. In fact it seemed worse because i would go less distance and use the same amount of gas. Anyways - What are some decently in-expensive ways to help improve. I've been reading up on it for a while and have been seeing a lot of stuff having to do with intake kits and/or exhaust systems. What are some good ones? I don't have a pot of gold to spend but I'd like to find some decent stuff to get. I'm looking for performance (hp and/or torque) and better fuel mileage. Right now I get about 17.5 MPG average.

Thanks!
Brendon
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dancerman
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Joined: 08 Jun 2006
Location: Atlanta

PostPosted: Wed Jul 19, 2006 6:39 am    Post subject: Reply with quote

This is my opinion on your question. The best thing you can do to get the best fuel mileage from your Cherokee is the following:

1) Keep your engine tuned. Replace the spark plugs, ignition wires, distributor cap and rotor and air and fuel filters.

2) Keep your tires inflated on the high side of recommended pressure. Also, buy tires that suit the type of driving you do most. Bulky tires with aggressive treads will use more fuel. Buy lightweight wheels to replace the heavy factory wheels.

3) Change oil every 3000 miles and run a fuel system cleaner through your tank at that time.

4) Practice mild and constant acceleration and braking.

5) Try different brands of fuel. I have found some give significantly worse mileage than others.

6) Only run your A/C if you really need it.

I have installed a high flow, catback exhaust and performance intake ('99 Sport 4x4, Auto, 4L). There is a slight improvement in acceleration which I like. But it did not increase my mileage (still 17-21mpg).

Even doing the things I stated will NOT make a huge difference. Cherokees are not aerodynamic and they are heavy. The 4 L. engine is basically old technology and high mileage was not a design consideration. Durability and long life was.
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ThePhantum
Pissed-Off Admin
Pissed-Off Admin


Joined: 23 Jan 2004
Location: I knew it...I'm surrounded by Assholes!

PostPosted: Wed Jul 19, 2006 9:23 am    Post subject: Reply with quote

17.5 MPG is pretty good for a rolling brick. You could spend gobs of money on cat backs and air intakes...but you'll only pick up another 1/2 point. Doing what is stated above will help. Also change the O2 sensors, when you tune it up.
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RockOn
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Joined: 04 Mar 2006
Location: Murfreesboro, TN

PostPosted: Wed Jul 19, 2006 3:21 pm    Post subject: Reply with quote

dude man you got all your gonna get for the most part. After market stuff may help or it may not. Then think about the money your investing in trying aftermarket stuff. It would be better spent on high quality/ high octane fuel.

I get alot better mileage with high octane fuel.
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monkeyman3875
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Joined: 06 Jul 2005
Location: Charlotte, NC

PostPosted: Wed Jul 19, 2006 6:14 pm    Post subject: Reply with quote

High-ER octane I've found can help, but I've also seen a drop if it's too high. I normally use regular and was looking for an increase in MPG as well. I did a little experiment with my cherokee and found that on a full tank of regular I usually got about 350 miles (90% highway) and with plus (medium) I got around 400 miles (same driving). However, I tried the same thing with premium and it seemed that I was only getting 350 or less. I don't know...just my .02
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-130k Miles (and counting)-> let me know of any preventative maintenance you guys can think of. PM me.
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