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Improving Jeep Cherokee/Grand Cherokee Gas Mileage

11 messages,  Last post on Aug 08, 2012 at 7:08 AM

You are in the Jeep Cherokee and Jeep Grand Cherokee Forum.

What is this discussion about? Jeep Grand Cherokee, Jeep Grand Cherokee SRT-8, Performance Mods, SUV

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#1 of 11 2001 Cherokee Gas Mileage by tdose

May 15, 2008 (7:09 pm)

I'm getting very bad mileage on my 2001 cherokee and am trying to replace the air intake, exhaust and oil. I can't find an exaust kit for the 2001 model other than the Gipson for $300, I really want to put a flowmaster 70 sieries but I can't find any pipe kits.
 
Does anyone have any suggestions on anything that will get me better gas mileage?

#3 of 11 Re: 2001 Cherokee Gas Mileage [tdose] by 66phil

May 16, 2008 (12:15 pm)

Replying to: tdose (May 15, 2008 7:09 pm)
Hi , I have a 97 , 5.2 v8, , so this may not apply exactly. I had 110,000 miles on it and I was running somwhat rough and showed it had an o2 sensor engine light problem. I replaced both o2 sensors with little improvment. What the problem was, the catylatic converter was pluged up, as well as the muffler. I replaced the converter with a performance Flow Thru type , and I bought a Thrush flow thru , street legal muffler, which has a 2 1/2 in outflow. This is larger than the factory 2 1/4 inch. I took it to a muffler shop and had them make a 2 1/2 inch pipe to extend this all the way out. The muffler shop at first didn't want to do it, it is eaisier for them to put on a ready made 2 1/4 inch pipe. It was $81 for the custom made one. I want to ad a few footnotes. I bought the converter on eBAy, it was about $85 with shipping. About half of what it costs at your local auto store. I bought the Thrush muffler at my local store, it was only $21.00. This is not the loud one, it is the street legal one, and it is very subtle and perhaps just slight louder than your standard stock type. I am sure you wouldn't be able to tell the difference if you heard it. I was able to remove the old muffler system and install the converter/ thrush myself. I did have to have the muffler shop finish the tail pipe, and they also welded everything together. My miliage went up Drastically. It is a little hard to gauge because my engine was running rough for maybe 6-8 months, but I have owned 2 19 96 Grand Cherokees and neither of them ever performed this well ? My in town miliage is up 4 mpg. Sometimes 5 mpg. Please keep in mind that my car was running rough, I also changed plugs and the air cleaner, but on my real time miliage guage on my headliner console, I will get readings sometimes of 32- 34 mpg when I am cursing at 50 mph. It never read that high ever, on either of my cars. Hope this helps someone. Phil Barry, Dunedin, Florida

#5 of 11 Re: Re: 2001 Cherokee Gas Mileage by tdose

May 16, 2008 (10:06 pm)

Thanks I will keep that in mind. I did find what is was looking for at rusty's offroading.com its a great site and i would tell everyone with a jeep if i could.

#6 of 11 2003 Cherokee rough Idle/spikes by bscarcella

Apr 20, 2009 (2:01 pm)

My 2003 Jeep, at start up the RPM's climb to 2K, then very rough idle, RPM spikes. replaced Idle Air Control Valve, also new plugs. any suggestions

#8 of 11 95 jeep by jeepia

Mar 12, 2010 (1:27 pm)

I have a 95 jeep grand cherokee laredo v-8 and it use a lot of gas. is there some things to do to give it better gas mileage I brought it used with very high mileage I like it, but the gas part. also I need to find a manual on it for the upkeep, ca not afford the new trucks. I know it need a lot of work to be that old and high mileage, but with tlc and new part could it be good. thanks

#9 of 11 overheating gr cherokee 94 5.2 by greyfox61

Mar 22, 2010 (2:24 pm)

overheats after 20 min drive in temp exceeding 70 no problem in cooler weather.Replaced waterpump, pressure cap, radiator,hoses,fan clutch.It has 50/50 antifreeze.also left out the thermostat.It will cool down by running the heat w/fan on high.Problem started last yr after having a/c worked on,still don't work.

#10 of 11 Re: overheating gr cherokee 94 5.2 [greyfox61] by tuggajb

Mar 22, 2010 (3:09 pm)

Replying to: greyfox61 (Mar 22, 2010 2:24 pm)
sounds as if electric fans not working not good ides to run without thermostat drives computer control nuts

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