My DD is a 93 3.9 I need help my mpg is hooooooorrrrriiiibbbblee last I checked I got 7.45 mpg all I've done to it is a new exhaust a small lift with tires (yes I included the tires when I did my math)and a upgraded ignition system, I'm on a very tight budget I got a electric fan from a 93 Taurus I'm thinking about putting it in but what's the pros and cons of doing the electric or any other tips on getting my mpg up cuz this is ridiculous

 

That's pretty low. I'm getting <14.5 mpg on my new to me dak. I'm working out the kinks as it runs poorly right now.
Putting in new cap, rotor, plugs and wires usually helps MPG's. That's about $100 at napa for the good parts and Champion regular plugs. I ended up changing the pickup or switch plate as well.
You might want to check for vacuum leaks too. That's what's up next for me. Then sensors and hopefully not wiring.

 

No vacuum leaks just checked them all

 

You've got something seriously wrong if you're only getting 7 mpg with a V6 and an electric fan isn't going to cure it.. I get 13 mpg in the city and I have a 5.9, larger throttle body, larger exhaust, and am very heavy on the throttle. I know the 80's-90's turbo-mopars would get crazy rich and very poor fuel mileage when the O2 sensor took a crap. I've never had or seen an O2 failure on a Dakota so I'm not sure if a bad O2 causes the same poor fuel mileage. You also might want to check the plenum gasket at the bottom of your intake. If that is leaking it could, theoretically, cause more fuel consumption because it's an air leak.

 

E-fans give no increase in mileage and no noticeable increase in power. They are, however, quieter than a fan clutch driven fan.

If you're only getting 7 mpg, you have something seriously wrong with your engine and engine management systems, or someone's stealing gas from your tank on a regular basis.

 

+1 to the O2 Sensor. mine is shot and im getting about 11-12 around town. put a new one in and it jumped to around 15-16 around town, but then it took a crap and i put the old one back on to fix the stalling issue it developed.

 

I would recommend an NTK O2 sensor made by NGK. NTK are factory Mopar sensors so if you can't find an NTK then get a Mopar one. I've had a lot of Bosch sensors fail sooner rather than later.

 

In addition to not using Bosch, be careful in the handling and installation of O2 sensors, getting oil or grease on them will cause them to fail.

 

But I just replaced it not even a year ago..

 

Yeah, there's something else going on with your MPG. I get 18-20 MPG (combination driving) with my bone stock V6. No desire to change to an electric fan. If it ain't broke.......