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post #1 of 24 Old 04-01-2009, 09:05 PM Thread Starter
 
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easiest way to better gas mileage?

what mods can I do to increase the gas mileage? I know its not a prius.. but just tryin to get a little better fuel economy? new plugs wires? cold air intake? anything else?
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post #2 of 24 Old 04-01-2009, 09:12 PM
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post #3 of 24 Old 04-01-2009, 09:38 PM
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Just drive like grandpa. If you don't hit Jackrabbit starts or run the rpm's high on each shift, you'll end up with better mileage. I've seen between averaging 16.5 - 16.9 for my ride over the past 48 hours I've owned it, but I've been driving it like I stole it.



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post #4 of 24 Old 04-01-2009, 11:10 PM
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Im getting an average of 17 to 20. 17 around town not driving like a maniac. 20 on the highway with the cruise set. About 15 offroad driving like a bat out of hell, but hey thats ehy I bought it.

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post #5 of 24 Old 04-06-2009, 09:41 AM
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Quote:
Originally Posted by CHI-TOWN-JK View Post
what mods can I do to increase the gas mileage? I know its not a prius.. but just tryin to get a little better fuel economy? new plugs wires? cold air intake? anything else?
I find I get better gas miliage if I just set the cruise Control to 65 and relax.

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post #6 of 24 Old 04-06-2009, 10:19 AM
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There were a whole lot of talented engineers that squeezed every bit of MPG out of this Jeep that was feasible to be had. There are more mods you could do, but most likely, you'll never recoup the cost of doing them. Like the previous poster said, drive like grandpa.

Once you lift and get bigger tires, a gear change will optimize mileage and performance. No matter what kind of sticker you put on it, it's still a two ton aerodynamic brick.

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post #7 of 24 Old 04-06-2009, 10:19 AM
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post #8 of 24 Old 04-06-2009, 10:43 AM
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Agreed with all of the above.
99% of the time, the BEST way to get better gas mileage is changing your driving habits. Moderate throttle and low RPM's for acceleration, and learn to maintain your speed.
Next best thing is routine maintenance- tire pressure, oil and filter changes, etc.
After that, a higher-flow exhaust and intake will help SOME, but tend to negate that value by making you floor it more often
Plugs probably won't do jack, and wires might help a LITTLE. The factory plugs are dang good, with almost no room for improvement as long as they're in spec (gap).
Also, keep the A/C off- you have a convertible, ya know? Mark W.
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post #9 of 24 Old 04-06-2009, 04:12 PM
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keep it in the driveway
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post #10 of 24 Old 04-06-2009, 04:35 PM
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Its a Jeep not a hybrid live with it or buy a "Prius"
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post #11 of 24 Old 04-06-2009, 04:36 PM
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^ No need to be like that. I'm sure keeping a few extra bucks in each of our pockets would be a welcome addition. The best way, as I said above, to get better economy is also the best way to go faster on the race track- learn to drive better We all can do it, and it's often free (or cheap, at least)- Mark W.
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post #12 of 24 Old 04-06-2009, 06:01 PM
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post #13 of 24 Old 04-06-2009, 06:16 PM
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Quote:
Originally Posted by jacktuttle View Post
I find I get better gas miliage if I just set the cruise Control to 65 and relax.

Thats exactly what I have found to work the best, 65 seems to be the best cruising speed


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post #14 of 24 Old 04-07-2009, 06:27 AM
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^ That'll depend on your gears and tires, of course.
62 with stock 29's (base model wheels and tires) and 3.73's is where our sweet spot is.
Also, I forgot to mention, getting rid of unnecessary weight and aerodynamic obstructions helps. Thus, N39 was on the right track Mark W.
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post #15 of 24 Old 04-07-2009, 06:46 AM
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There's no real "trick",just basic stuff and common sense.Free up the intake and exhaust,keep your foot out of the firewall,and use cruise control as much as possible.I average around 19.5 locally,and on the hwy so far it's been around 22mpg.However I expect that to increase a bit as I get more miles on my vehicle (only 800 now).Further: the use of full synthectic fluids in the drivetrain will yield a bit more mpg due to less friction etc.I'm sure your already aware of keeping the tires properly inflated too..

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post #16 of 24 Old 04-07-2009, 07:29 AM
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Believe it or not, your brake peddle, or the way you use it, has a lot to do with gas mileage too. If there is a stop light stop sign or turn ahead, ease off early and let the thing coast for a while. The time you save by staying in the gas till the last minute and than braking hard just doesn't exist. You will just spend more time sitting at the light waiting for it to change. If you time it right, you may not even have to come to a complete stop. That saves a bunch of gas. You also save on brakes. My Trooper had 80k miles on it when I traded it and the brakes were still in good shape. I pull a trailer a fair bit as well. My Jeep is approaching 1000 miles and I average 20.5 mpg.
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post #17 of 24 Old 04-07-2009, 02:09 PM
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Does anyone with a lift and any tires bigger than stock or regearing have some mpg numbers?

I have 35's and 4.88 gears and at best I get 12 mpg. That is between 70-75mph. In town it is about the same. I do not have a CAI or exhaust. Stock on those aspects. It is still better than my Dodge Dakota that I sold.

Just curious to see what others get with similar mods.

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post #18 of 24 Old 04-07-2009, 02:14 PM
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I'm on 35's and 4.10's I get 13ish on surface streets and about 16 on the highway at 70-75.

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post #19 of 24 Old 04-08-2009, 08:07 PM
 
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I'm on 33x12.50 2in lift with 373 and an auto. Just now turned over 1100 miles. So far I been gettin bout 16 city and the only 2 short road trips I been on got bout 19.5 to 20. I'm an old fart and I drive like one LOL........Oh yeah hwy speed bout 65 mph
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post #20 of 24 Old 04-10-2009, 03:32 PM
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I'm guessing your drive on 35's at 70 are not up n down hills. My trips are mostly through the mtns. of Northeast Pa down to MD. That may be some of the difference aside from the 4.10s

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post #21 of 24 Old 04-11-2009, 06:15 AM
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Find a gas station that has real gas. My MPG went up 1.5. The ethanol stuff is crap. 33's, 2.5 lift, lots of heavy shat, I get around 14.5.

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post #22 of 24 Old 04-11-2009, 06:25 AM
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Gained 1MPG on the computer about .5 MPG tank to tank when I changed to Bosch 4+. The real gas works on the highway, almost 2mpg, but around town I haven't seen much. So I average 16.5 in town with any gas and average about 22MPG with real gas on highway when running to OKC. But nowdays the wind has killed anything over 16.5 even on the highway.

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This is exactly why we need to practice proper gun control.

If he was aiming down the sights correctly and had plenty of practice rounds under his belt, there would only be one side of this story.
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post #23 of 24 Old 04-11-2009, 06:35 AM
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Quote:
Originally Posted by Broncojohn View Post
Gained 1MPG on the computer about .5 MPG tank to tank when I changed to Bosch 4+. The real gas works on the highway, almost 2mpg, but around town I haven't seen much. So I average 16.5 in town with any gas and average about 22MPG with real gas on highway when running to OKC. But nowdays the wind has killed anything over 16.5 even on the highway.
Hate to tell you, brother, but you swapped to an inferior plug, and the gain is most likely due to a change in driving habits more than anything. The +4's foul constantly, and are a WASTE of $. In back-to-back dyno tests, they ALWAYS LOST power vs. any other plug, including basic Autolite coppers.

The only emperical chance of your gains being repeatable is if your stock plugs were gapped wrong, worn, or some other mechanical issue. And 0.5-1 MPG gain from plugs alone is again only possible if a stockie was fouled. Did you notice a big gain in power as well?
Sorry brother- I don't mean to crap you out, but those plugs are garbage. They're better than nothing, but swap back to a new OEM plug when you get the chance, and check your gap. Cheers- Mark W.
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post #24 of 24 Old 04-11-2009, 08:16 AM
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Quote:
Originally Posted by thaduke2003 View Post
Hate to tell you, brother, but you swapped to an inferior plug, and the gain is most likely due to a change in driving habits more than anything. The +4's foul constantly, and are a WASTE of $. In back-to-back dyno tests, they ALWAYS LOST power vs. any other plug, including basic Autolite coppers.

The only emperical chance of your gains being repeatable is if your stock plugs were gapped wrong, worn, or some other mechanical issue. And 0.5-1 MPG gain from plugs alone is again only possible if a stockie was fouled. Did you notice a big gain in power as well?
Sorry brother- I don't mean to crap you out, but those plugs are garbage. They're better than nothing, but swap back to a new OEM plug when you get the chance, and check your gap. Cheers- Mark W.

Info Noted: I've always run standard Champion, even in the aircraft I maintain, and understand the hype, I wanted the 2 prong but they only had the 4 so I said what the hell. No power gain or idle smoothing, and no change in driving habits. The original plugs are gapped properly and I still have them, 5K on them. I wanted to see what would happen and what the hype was all about. If any plug is fouling including the Bosch then there is a problem somewhere else. These new engines run very lean and clean.
The plugs I pulled out looked new with just some minor discoloration. If I have any future problems they will go back in.

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Originally Posted by Jscwerve View Post
This is exactly why we need to practice proper gun control.

If he was aiming down the sights correctly and had plenty of practice rounds under his belt, there would only be one side of this story.

Last edited by Broncojohn; 04-11-2009 at 08:43 AM. Reason: Changed Verbage, may have been insulting and not intended:-)
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