I recently purchased a 1998 cherokee classic and I was wondering what I could do to increase the vehicles fuel economy, I have already thought about getting a k&n filter, but I can not decide between the drop in or the canister with the complete induction. does anyone have any suggestions. thanks.

Jeeps are not energy efficient. 14 to 18 MPG is pretty typical for the cherokee. This is their main weak area. When it comes time to repair, go for less restrictive exhaust. Synthetic oil, K&N air filter. Drive the speed limit.
Best of Luck: Bob

K&N filter or cold air intake will not usually do anything for mileage.
For mileage you usually start with a tuneup and then a low restriction
exhaust to lower pumping losses. Changing the differentials, transfer case and engine to Synthetic can add a little mileage. In the non-winter months you can run All-Season passenger car radials to reduce rolling resistance. Keep your right foot off on the floor. Mileage can vary 30% between drivers on the same driving route, make sure your drivings habits are good ones and not bad.
I usually get 20-22mpg with my '98 Cherokee 4.0l, I check it everytime. I have a bad habit of far exceeding the speed limit the first 3/last3 miles of my daily work comute so my mileage could be better (28 miles round trip). Got 23mpg a couple of times b/c the weather was snowy/icy and I didn't hot rod the last few miles to and from work.

Here is how I increased my mpg. I usually get around 15 miles/gal or 300 miles with a full tank in my 93, 4.0. I mainly drive back and forth to work which is about 20 miles one way. I used to get up to 65/75 mph on my route. Now I do not drive over 55 mph, usually it's 45-50 mph. I accelerate really slowly and try not to use my brakes when I need to stop or slow down. Meaning, I am not going fast enough when I get to a stop sign or make a turn to use my brakes that much. No A/C either, windows all the way down! At last measurement, with lots of trig and calculus, I came up with 19.4 mpg about 385 miles and an increase of about 29.3%. At $3.11/gal it makes a huge difference in the long run. Oh yeah, expect a long line of cars behind you and lots of people zooming by you. I just thinking of the extra $20 every 2 weeks to let it bother me.

Jeeps and fuel economy don't sound right in the same sentence.

The new Jeep Compass is rated 26 city / 30 highway.

The new Jeep Compass is rated 26 city / 30 highway.

thats not a real jeep...:nono: Anyway When you buy a jeep you are not thinking of the MPG, why you think you are going to get great mileage is beyond me ..i bought my 96 xj knowing that i would only get around 18-20 Its a rolling Box so getting more MPG may be a little tricky TuneUps and proper size tires will help accomplish that but if you are wanting to use bigger tires and modify the suspension than you have to pay to play:iceslolan

Brainyass is right, slow down. But rolling all the windows down and no AC when it is 120 degree out is crazy and driving that slow in California might cause road rage.
That when I use my wife's Camry.

No A/C either, windows all the way down!

Did you know that if you leave your windows up you will get less wind resistance than if you had them down, and driving like a granny can get you shot these days. really youre not getting that much more mpg than if you just drive somewhat normal:rofl: