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Unread 07-10-2013, 08:08 AM   #1
HemiJeep7
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Improving Gas Mileage

Is there anyway to improve gas mileage on the WK Grand Cherokee? I'm only getting about 10 MPG and I have to refuel about every other day.

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Unread 07-10-2013, 08:26 AM   #2
scootr29
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Get a diesel....
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Unread 07-10-2013, 08:43 AM   #3
Jeepforthewin
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Go easy on the skinny pedal is the easiest way to improve it! How long has it been since you changed the spark plugs? I went from getting 11.5 to barely 12 MPG's to 13.5 after i replaced my sparkplugs!
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Unread 07-10-2013, 09:47 AM   #4
90grandoneer
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First, do a search and you'll find many threads on this subject. There are many ways but, as said, driving habits are the biggest factor. Tire pressure is also a biggie. I run 40 PSI in the fronts, and 38 PSI in the rears. Other than that the best way is to increase the Volumetric Efficiency (VE) of the engine. This is done by improving the flow of air through the engine.....mainly intake, head port/valve size, cam timing, and exhaust. With our Hemi's, IMO, the biggest weak spot is, by far, the exhaust system, specifically the small "log" style manifolds. Also, the transmission shift schedule can adversely affect fuel economy. With my mods. (see signature) I get about the same as others in town (~13-14 mpg), but on the highway my range is 20-24 mpg, with a normal of around 22 mpg. Remember these things (4WD Hemi models) weigh ~4800 lbs. without you and any stuff you're carrying. I figure mine, with me, the wife, a full tank of fuel, and camping equipment runs a little over 5500 lbs. In town, the normal weight is the biggest problem......moving the mass from a stop everytime.

Currently I am doing a little test with mine. I went to the drags this past weekend and changed the WOT upshifts from 6000 RPM to 6200 RPM. I was in a hurry and didn't insure my custom shift schedules were still installed and they reverted to the canned ones in the tuner. I've noticed that my MDS works a whole lot less now, and after filling up my FE is down almost 2 mpg, so far. I'll do a couple mileage tests to verify if this continues, and I'll have to return it to the stock tune when I take it in to the stealer for the transfer case actuator recall. That should be real fun then.
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Unread 07-10-2013, 10:47 AM   #5
bhawks28
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this topic comes up, what...once a week?
First off, you have a Jeep. Don't expect good gas mileage.

https://www.google.com/search?q=site...gas+mileage&oq

I clicked up to page 5 on the Google results and there were STILL threads about this topic.
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Unread 07-10-2013, 04:08 PM   #6
90grandoneer
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To give you an idea on the lousy stock 5.7 exhaust system, here's a link to the thread I did on the differences between the stock 5.7 WK and LX "log style" exhaust manifolds. You can see that the LX ones are quite a bit better than the WK ones.

http://www.jeepforum.com/forum/f67/b...-7-wk-1174042/
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Unread 07-10-2013, 04:27 PM   #7
BoraBora
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Search bar. However the main way to improve gas mileage is to go easy on the gas pedal and try and avoid stop and go traffic. Going 55 mph also is the sweet spot for the best gas mileage. We drive Jeeps...poor gas mileage is a given. At least it's not an FJ or Hummer
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Unread 07-10-2013, 07:24 PM   #8
johngreen1234
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On the freeway or rural highways, I get around 19 mpg. Burn a tank of gas on stop and go errands, I end up around 15-16 mpg. I can imagine that true city driving (which I try to avoid at all costs) would really cruch the mileage.
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Unread 07-10-2013, 07:26 PM   #9
sebastien
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make sure your tire pressure is good..
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Unread 07-10-2013, 08:10 PM   #10
Butterjeep
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Make sure you have fresh spark plugs.
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