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Mr.Sleepy
Dodge Dakota
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4/30/2004
08:19:00

Subject: RE: improve gas mileage, 4.7L??
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Not to pick on people, but I found that a tune up makes little or no difference if you don't have at least 65k+ on your plugs. Also if you add a aftermarket exhaust you will more than likely hurt your city driving. Aftermarket exhaust will rob you of some low end torque and in stop and go traffic the more torque the better. If your a highway cruiser then get the exhaust. But bang for your buck, if your buying the exhaust for mileage then save your money, the exhaust gains for MPG will never pay for itself by the time you get rid of it.

You have to ask yourself what will pay for itself when it comes to mileage upgrades. Very few upgrades help mileage and out of those, and very few of those will pay for themselves in gas savings by the time you get rid of your truck.



Evan
Dodge Dakota
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4/30/2004
16:58:57

RE: improve gas mileage, 4.7L??
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Mr Sleepy, what kind of plugs do you run that are still good at 65K? I work on 3-4 Daks /day and I have yet to see a Champion or Autolite that isn't worn out after 30K. In my opinion, if you spent $24 on new plugs and got 1+mpg increase it would be worth it at $2.10/gal. As far as exhaust mods, a good quality muffler with the same size pipe will not decrease torque, but a 3" cat back will. I install 5-6 exhaust systems per week on Dodge and Jeep vehicles and have noticed good to great improvments in all of them....if you get more power with less throttle, you will typically see gains in milage. At $40/fill up, an extra 25 miles/tank will pay for a $125 exhaust system in 6 months. Just my $.02 based on 20+ years as a professional mechanic and Dakota/Wrangler owner... I was simply answering Jays question with a cheap($24) solution to a problem I am sure everyone is feeling these days, getting reamed at the pump! Hope this helps, Evan dakotaparts.com



Mr.Sleepy
Dodge Dakota
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4/30/2004
18:47:24

RE: improve gas mileage, 4.7L??
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Evan, I can appreciate your expertise on the subject but working on that many Daks a day I expect you see what the average owner does. I use fuel injector cleaner and fuel system cleaner on a regular basis with standard bosch plugs. I've never had replace my plugs till 70k or so. Saves money and time. I've replaced my factory plugs at 40k with very little wear and tear on them. I can understand the pursuit of the perfect mpg truck. But exhaust often robs you of low end torque which hurts city drivers. Many people including myself have noticed a drop in mileage due to aftermarket exhaust systems. The biggest thing to do when wanting to save gas is to simply give up the truck. Sad but true, I will sell my dak if gas peaks at 2.20 and stays there for more than 3 weeks. Honda Hybrid is my next stop. I simply cant afford to keep feeding this piggie. Even at 16.5 mpg.



Jeremy
Dodge Dakota
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4/30/2004
23:13:01

RE: improve gas mileage, 4.7L??
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I gotta post again and agree with ya'll. I got my 4.7 V-8 and when I bought it, I knew I'd be paying more for gas than I did with my 2.9 V-6 Bronco II(actually, I get maybe 2-3 mpg less than the V-6). But you know what? I really didn't care b/c I knew I was buying a V-8 and I was willing to suck it up b/c I wanted that sweet sweet power. I love my V-8.



Kowalski
Dodge Dakota
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5/01/2004
07:06:29

RE: improve gas mileage, 4.7L??
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Good point. Flogging my old gutless Toyota 4 banger to try to keep up with traffic got me 20 mpg. My 4.7 Dak is good for 15 without any attempt at economy; and now others can try to keep up with me. Trade happiness for 5 mpg ? I don't think so. Maybe some of the v-6 guys will be trading; I don't think anyone in their right mind with a v-8 should, unless they really don't need a truck.



01Motorsport
Dodge Dakota
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5/03/2004
20:33:33

RE: improve gas mileage, 4.7L??
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I did the "trade happiness" for mpg thing in 1985, and had to live with my mistake until 1993. At the time, I owned a '77 Dodge Van LWB w/318 that got 13 mpg AFTER headers, duals, Jacobs ignition, Holley Econo 4bbl and Edelbrock SP2P. I then bought a wimpy 100hp Dodge Mini Ram Van 2.2 4-cyl 5-spd. that got 22 mpg overall, but wouldn't scare a turtle. After one test drive in a '92 5.2 RC Dak, I was back where I should have been. The '92 got 17.5 mpg overall, my '01 4.7 5-spd 3:92 RC gets 18 city and 19.5 hwy. Now THAT'S "cake and eat it, too!".



Dr. D
Dodge Dakota
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5/04/2004
22:54:12

RE: improve gas mileage, 4.7L??
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AMSOIL from bumper to bumper .... It worked for me !


Dr. D



Hoss318
Dodge Dakota
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5/05/2004
00:45:08

RE: improve gas mileage, 4.7L??
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My last road trip I got 25mpg, dividing miles on the tripometer by the amount I filled up with, and I topped it off.
4.7L 5-speed 3.55 rear, 3" cat and dumped cat back, HO cams and intake, etc. etc.
RT



Jeremy
Dodge Dakota
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5/06/2004
10:32:40

RE: improve gas mileage, 4.7L??
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I just filled up today and drove the 6 miles back to my house. I followed Mr. Sleepy's advice on the previous page and kept my RPMs below 2500. I got 18.5 mpg, which is the best I've gotten with this truck so far. It just sucks not slamming the pedal b/c with all this power, its hard not to, haha.

2000 CC, 4.7L V-8, 4x4, Airaid intake



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