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4.7 more power and better gas mileage

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4.7 more power and better gas mileage

  #1  
Old 08-02-2013, 10:09 PM
Kevin Matney
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Default 4.7 more power and better gas mileage

I love to get 4.7 more power and better gas mileage out of my 2004 4dr cab 4wd
 
  #2  
Old 08-02-2013, 10:57 PM
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We all would Kevin but, your quad cab is one heavy truck so it'll never do great on mileage. A lot depends upon your left foot.

What gears do you have? What are you getting for mileage? O2 sensors do get lazy as they age, as does the MAP sensor.

You can get a flash.
 
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Old 08-03-2013, 08:51 AM
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There really isn't anything, the 4.7 has almost no aftermarket support. But some basics that don't hurt your fuel economy and boost your power. Exhaust, fastman tb and good spark plugs (nothing exotic, but good copper ones). Now you can also do a cold air intake but I suggest you kind of ignore it, I mean it can help but not really. Build your own if you really want one.

Other things that can benefit you is a 5-speed tranny and 3.92 gears. The 5 speed auto will do 70 mph at ~2000 rpm with those gears, the 5 speed manual I think is closer to 2,100 at 70. The manual transmission is hands down the best, if you have the choice get it.

As for the o2 sensors and map, he is right, they do cause problems. Check them on occasion and from what I've heard sometimes it is wiser to replace it when you think it is failing versus you get a code say they have.
 

Last edited by Blacknights; 08-03-2013 at 08:55 AM.
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Old 08-03-2013, 11:03 AM
bpark8824
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Yeah, there really isn't a lot you can do, but let us know what you're getting for gas mileage now. That way we can tell if you're getting what you should be or not. The truck won't be great on gas but the 4.7 has some decent power from the factory compared to other trucks in its class, its not a dog by any means.

I used to pretty regularly get about 17.5 mpg with mine, which is a 5 speed w/ 3:55's.
 
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Old 08-03-2013, 11:38 PM
Kevin Matney
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I have pos rear end with 3.92 gears and the over drive auto.
It never had good mileage. On the highway with nothing on the ball. it would only get about 15 mpg. Put on a 6 x 12 trailer it goes to 10 mpg.
Starts good and runs fine.
 
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Old 08-03-2013, 11:40 PM
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I'm about 12mpg city and about 22mpg highway.

For a truck.. eh.

I got my Fusion and it worked out because of the cost. I either pay $400 a month in fuel for the Durango. Or I pay $250 a month for my car and another $150 in fuel. Either way I'm still paying $400 but at least I'm getting something for my money.

Maybe this applies to your situation (I also kept my Durango because..well, it's a "truck")
 
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Old 08-04-2013, 09:32 AM
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You get 22mpg on the highway with your Durango!? I could do 65 all day with my Dakota which has 3:55s and only get 19-20. I've never touched 22. The best I've ever got was 20.5 and that was on roads that were 55mph for a long time.
 
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Old 08-04-2013, 02:47 PM
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Yeah. That's a 3.55 rear with 32.5" tires @70 mph.
Before the Jeep TCM swap I got about 19 @ 70 mph
This is with the AC system off as I only drive the durango for road trips which I usually take a month off in December for. Two years ago was to Colorado, 1,400 miles. Last year to Cali, 2,100 miles.

The trip computer is never more than .5 mpg off from fuel pump numbers.
 
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Old 08-04-2013, 03:51 PM
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What did the Jeep TCM swap do to help?
 
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Old 08-04-2013, 03:54 PM
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Turned my 4 speed auto into a 5 speed auto.
 

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