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Fuel System All Fuel Discussions. MPG - Mileage - Fuel System Maintenance including Air Filter Replacement.


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  #1  
Old 07-15-2010, 01:30 PM
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Default 1998 5.2L Mileage Expectations

Hi folks, I recently bought a 98 1500 extended cab 2WD with the 5.2L V8. I started out only getting 200 miles on a tank of gas when driving around town. I had the engine tuned up and am now up to 250 miles. These are local road miles and not highway miles. I had a 2000 1500 5.9L V8 in the past and got up to 300+ miles to a tank so that is what I am comparing it to.

My questions are this:

Do you have any suggestions on what I can do to improve my mileage?
Is this what I should expect for my mileage with the 5.2L engine?

Any assistance here is greatly appreciated.
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Old 07-15-2010, 02:02 PM
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The 5.2 is going to have to work harder so I would expect lesser fuel economy. Start with the CAI and exhaust and perhaps a tuner.
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Old 07-15-2010, 02:13 PM
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Don't expect much more than that . I would definitely recommend a tuner , cold air intake , maybe an electric cooling fan , headers and exhaust system . Anytime you can help it breathe better is a plus .
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Old 07-15-2010, 07:50 PM
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I checked the CAI to see if maybe it wasn't fully connected or was dirty. It did look like the tube that connects to the engine bay wall wasn't fully in place but wasn't hanging free. The connection to the air filter housing doesn't seem to be the tightest either. The air filter didn't look too bad. Do you feel that it needs to be a snug fit or is it okay that it is a little loose?
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Old 07-15-2010, 07:55 PM
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It doesn't hurt . I removed mine for a K&N cold air intake .
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Old 03-13-2011, 08:03 PM
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I can tell you from expertience, that biggest MPG improvement on the LA series Magnums, is to remove the engine-driven steel fan, and replace it with an electric.

This was suggested to me by Marty at KRC performance a few years back, and damn if he wasn't right.

My '99 Dakota 5.2 picked up over 1 MPG on the highway, and about .75 MPG around town, by switching to a BM 180 fan.
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Old 03-13-2011, 09:52 PM
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Quote:
Originally Posted by dschluet View Post
I checked the CAI to see if maybe it wasn't fully connected or was dirty. It did look like the tube that connects to the engine bay wall wasn't fully in place but wasn't hanging free. The connection to the air filter housing doesn't seem to be the tightest either. The air filter didn't look too bad. Do you feel that it needs to be a snug fit or is it okay that it is a little loose?
Is it a quality CAI unit? I had a low cost unit I put on my 06 with the 4.7 and it actually caused a drop in mileage and kept throwing computer codes. Replaced it with a K&N unit and saw an improvement. Is it possible that you are getting leaks with the lose fittings?
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Old 03-14-2011, 02:43 PM
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Anything is possible with this truck. All parts are pretty much stock on it and I'm pretty sure original as well. My mileage now is up to about 250 miles consistently so I'm satisfied with that.
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Old 07-02-2011, 11:21 PM
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i have an 01 5.2 and i was getting around 260 to 270 a tank got a 3 inch magnaflow cat back exhaust and i get 300 now . even if you just get a high flow muffler you will see some results. every little bit helps at $4.00 a gallon
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