4.7L mpg increase - Jeep Commander Forums: Jeep Commander Forum
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Old 09-28-2012, 08:41 PM Thread Starter
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4.7L mpg increase

So I've done done searching and nobody really seems to reply with what kind of mpg gains they're getting with the 4.7 after doing modifications. I'm really sick of filling up every week and I don't want to trade in the commander (because I can't think of anything id like more) so I'm looking to modify the commander to get at least a couple more mpgs! Im getting 14.5mpg with the 2" lift and all terrains but im looking into a programmer either the superchip or hypertech also an intake. What are some other mods I can make to get this thing to go a little bit farther on a gallon?
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Old 09-28-2012, 09:45 PM
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Brenden,

You will most likely spend more on mods than you will save in fuel. Just my thoughts. The most common mods would be: Less restrictive exhaust, CAI, programmer. The Commander was never made with fuel economy in mind. I get worse fuel economy in the commander than I would in a pickup with a larger engine.
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Old 09-28-2012, 09:58 PM Thread Starter
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That really sucks. I love my Jeep and wish I could just get it up to at least 18 or more mpg. What's bad is I am always browsing car lots looking at my options and there's really no advantage for me to own the jeep. Don't need 3rd row don't need off road capabilities because I have a suzuki samurai and I don't need towing power but for some reason I'd hate to get rid of the jeep I guess because I've taken it off road and seen its amazing capabilities. I just can't afford the poor gas mileage anymore and with new cars and SUVs coming out getting on average 20+ mpg I'm thinking a trade might be in my near future.
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Old 09-29-2012, 07:42 PM
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Sounds simple but sometimes driving technique can make a difference. If I am waiting in a line of traffic on the road or even in a drive thru, I always shut it off. Smooth starts and stops, not to mention slowing down a little can also help a little, and with our Commanders, every little bit helps. Lifting them and adding larger tires probably doesn't help either, but, Hey....It looks really cool!
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Old 09-29-2012, 08:11 PM Thread Starter
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When you say you shut it off do you mean completely shut down the engine? Wouldn't that use more gas? I don't remember what my mpg was before the lift and tires so I don't have the temptation to remove the lift or change tires. Too bad I don't have the 08 commander because the gains in hp and torque along with slightly better mpg with the superchips flashpaq would justify me getting it but with the minimal gains they claim with my 07 it doesn't seem worth it.
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Old 09-29-2012, 09:06 PM
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Originally Posted by BrendenV View Post
When you say you shut it off do you mean completely shut down the engine? Wouldn't that use more gas?
No, it would save gas.

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Old 09-29-2012, 10:34 PM Thread Starter
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Well yea I mean when the engine isn't running but what I meant is when starting it up doesn't that use a lot of gas?
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Old 09-29-2012, 11:04 PM
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how are you getting 14.5 w on yours ith 2" and all terrains? lol after i put my lift and 32's on i was getting 11 mpg. I now have a gibson exhaust, K&N cai, superchip, synthetic oil, and premium gas and i see about 14.5 in the middle of myrtle beach...
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Old 09-29-2012, 11:31 PM
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Originally Posted by BrendenV View Post
Well yea I mean when the engine isn't running but what I meant is when starting it up doesn't that use a lot of gas?
I know what you meant and the answer is no. See this---> http://www.consumerenergycenter.org/myths/idling.html

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Last edited by jeep5253; 09-29-2012 at 11:35 PM.
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Old 09-29-2012, 11:48 PM Thread Starter
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Jeep5253 that's pretty useful information thanks for the link ill try that although I don't let it warm up or hit the gas when starting I can understand idling uses a lot of gas.

Blue, I thought 14.5 was bad! Today I tried testing myself to see of I could slowly accelerate and brake early. I also put it in neutral when going downhill and coasting to a stop. I was able to maintain 20-23 mpg until I started hitting every single red light in town which in my area is a light on every corner. I couldn't TRY to hit every red like that! But it quickly dropped to about 16.5 and I got home at 17.3. Coasting in neutral seemed to help but I'm nervous that when I shift back into drive it thumps into gear.
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