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Old 11-17-2010, 06:36 AM   #1
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Default I need help to improve gas mileage...

I see a thread on here what is your gas mileage but would like some tips on what to do to improve my gas mileage, I am a mail carrier and I don't know if anything will help with all the start and stopping but even if I can improve it 2 or 3 mpg it would be worth it. My average now is 10 mpg. My Jeep is a 2000 Jeep Cherokee Limited ALL STOCK.

Last edited by denverdave; 11-17-2010 at 07:12 AM. Reason: forgot to add some info
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Old 11-17-2010, 06:53 AM   #2
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Originally Posted by denverdave View Post
I see a thread on here what is your gas mileage but would like some tips on what to do to improve my gas mileage, I am a mail carrier and I don't know if anything will help with all the start and stopping but even if I can improve it 2 or 3 mpg it would be worth it. My average now is 10 mpg.
Are you stock?
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Old 11-17-2010, 07:17 AM   #3
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search on line hydrogen xj gets like 45mpgs
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Old 11-17-2010, 07:43 AM   #4
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I replaced every fluid from front to back, replaced the spark plugs, found optimal air presure, and installed more efficient injectors. I went from 12ish to a reported 19.5 on the highway from the on board computer. It is a 2000 Sport with 27" tires.

for injectors, do a search on "Neon Injectors", they are 4 port instead of the older 1 port and atomize the fuel better.
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Old 11-17-2010, 08:37 AM   #5
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"703" injectors
full tune up / fluid change
optimal air pressure, low rolling resistance tires
better flowing exhaust

o2 sensor (upstream) may not be operating at 100%. May be worth changing for a new one - GREATLY affects air/fuel mixture and gas mileage
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Old 11-17-2010, 08:52 AM   #6
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http://www.cherokeeforum.com/f2/imporving-xj-mpg-37071/
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Old 11-17-2010, 09:34 AM   #7
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10 MPG are you sure your guage is accurate. I get better than that lifted.
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Old 11-17-2010, 09:36 AM   #8
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10 MPG are you sure your guage is accurate. I get better than that lifted.

Yeah that why i asked if he was stock, BC according to his Avatar he is. Somethings not right if hes only getting 10MPG stock
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Old 11-17-2010, 10:03 AM   #9
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Originally Posted by dukie564 View Post
"703" injectors
IIRC, a 2000 would use the "784" injector.

Lose some weight if you can. If you have factory skids and don't wheel it, yank 'em. Trailer hitch and don't pull a trailer? Yank it.
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Last edited by Reefmike; 11-17-2010 at 10:08 AM. Reason: added to post
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Old 11-17-2010, 10:12 AM   #10
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I am a rural mail carrier I drive 60 miles a day on my route and stop and start around 450 times in a 5 hour period. I don't get much worse when I have it in 4 wheel drive all day.
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Old 11-17-2010, 10:13 AM   #11
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takeing out of four wheel drive will help a lot
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Old 11-17-2010, 10:13 AM   #12
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Originally Posted by Reefmike View Post
IIRC, a 2000 would use the "784" injector.

Lose some weight if you can. If you have factory skids and don't wheel it, yank 'em. Trailer hitch and don't pull a trailer? Yank it.
I am no mechanic but my mechanic specializes in Jeep's, it a 784 injector a jeep cherokee? I am just looking for ways to improve my mpg without breaking my wallet, Does putting a magnaflow exhaust on help?
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Old 11-17-2010, 10:21 AM   #13
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Quote:
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I am just looking for ways to improve my mpg without breaking my wallet, Does putting a magnaflow exhaust on help?
The single most effective fuel-economy trick is to keep your foot out of the gas. Avoid jack rabbit starts, do 55 on the highway when everyone else is doing 70, coast when you approach a stoplight, don't idle the engine for too long. It'll lower your stress level too.
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Old 11-17-2010, 10:24 AM   #14
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784 injector (Bosch 0280155784) is an upgrade (4 holes instead of 1 hole) for 2000-2001 cherokees that allows better atomization of fuel and better gas mileage / smoother running as a result.

They usually (but not always) can be found in the vehicles listed on this page:
http://www.fuelinjector.citymaker.co...25/4735807.htm
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33x12.5 Mickey Thompson Baja MTZ Tires
285,000 mi and runnin' strong

RIP Brian "96_XJ" Perrine - You will be greatly missed...
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Project Danger Cart - A super-powered, high-tech vehicle designed by a genius, or perhaps space aliens
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Old 11-17-2010, 10:36 AM   #15
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Quote:
Originally Posted by denverdave View Post
I am no mechanic but my mechanic specializes in Jeep's, it a 784 injector a jeep cherokee? I am just looking for ways to improve my mpg without breaking my wallet, Does putting a magnaflow exhaust on help?
Quote:
Originally Posted by dukie564 View Post
784 injector (Bosch 0280155784) is an upgrade (4 holes instead of 1 hole) for 2000-2001 cherokees that allows better atomization of fuel and better gas mileage / smoother running as a result.

They usually (but not always) can be found in the vehicles listed on this page:
http://www.fuelinjector.citymaker.co...25/4735807.htm
^^^What he said
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