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JerryM
Dodge Dakota
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7/11/2010
01:35:26

Subject: 4.7 liter MPG
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Good day all,

Typically my 2000 4.7 liter gets about 13-14 MPG just driving around town. I do have the 4x4 model SLT with the slightly bigger tires, which also affects my gas mileage too.

Lately my MPG has dropped to about 10.5 The truck is running fine and I cleaned the PCV and changed the air filter and the plugs only have 10k on them. All my tires pressures are fine.

Anybody know of anything else to check or do, and what might cause the MPG to drop off like that.

Thanks!



ben
Dodge Dakota
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7/11/2010
14:14:54

RE: 4.7 liter MPG
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that happens to me in the winter when it gets cold but that couldnt be the problem this time of year. wheel bearings?



Roberto Dak01
Dodge Dakota
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7/11/2010
14:35:53

RE: 4.7 liter MPG
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It Could be many factors that makes to variate the MPG like, getting unnecessary stuff in your truck that weights too much, or changing your oil grade if you use a 5W-10 and go to 10W-30 or 10W-40 it will sacrifice MPG too, also it depends on your driving conditions if you have a heavy foot and you like to feel the power. Its fun!!!... but (power = Gas)

Good Luck!

Roberto Dak01
Minnesota!



Chris Chris
Dodge Dakota
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7/13/2010
01:49:02

RE: 4.7 liter MPG
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I have 2003 single cab 2wd with 3500 heavy duty manual tranny H.O. cams. I used to get 20 to 21 MPG (mostly highway) My milage dropped when Ethanol was first introduced here slightly, and, has now dropped to 18 roughly. I can buy gas from different vendors and it will vary some (upper 16's to low 19's) I think its due to an Ethanol content increase. I want to remember I'd heard that ethanol content would go up to 15% July first. I dont think that passed as the content stickers on the pumps still read "Up to 10%" I think they started using a full 10% mix. Perhaps even putting in a little more to strech out product. I've cleaned throttle body, tune up, checked all sensors with volt/ohmmeter, and run the same oil its always had. With 150,000 miles I have thought of doing a cylinder compression check. But the engine runs smoothly and has no symptoms to make me think anything major mechanically wrong.



JerryM
Dodge Dakota
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7/13/2010
04:47:28

RE: 4.7 liter MPG
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Thanks all for the info.

I did see a drop off about the beginning of June, I also heard something about gas additives being an issue.

As far as the wheel bearings Ben, I'll look into that but I think they are sealed types and cannot be lubricated? but not completely sure.



daddio
Dodge Dakota
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7/13/2010
08:07:38

RE: 4.7 liter MPG
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Jerry, usually when MPG suddenly takes a dive it indicates thta an O2 sensro is acting up or on it's way out. They can get "lazy" without throwing a code. I'd check that first before buying one.



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