Hey everyone,

I came across these wires on JC Whitney that claim to increase mileage by 15%. I am only curious if anybody has had any experience with these or if they would be a complete waste of money. I am very skeptical and didn't think the wires would be able to have this great an effect. Any thoughts?

http://www.jcwhitney.com/mpg/plus-ga...d=d1163y1996j1

 

What a complete load of crap.

There is no possible way that plug wires can give you a 15% bump.

Save your money.

Buy some quality wires (I use Belden usually) for about $30.

And stay away from the chips that "guarantee" similar gains. There is no free lunch people.............

Keep your vehicle tuned up, fresh fluids and expect 16-21 mpg on MOST Jeep Cherokees with a 4.0, give or take a bit either way.

 

Any good tuneup, will produce MPG gains of this much. Do the math, 10% of 10 MPG's is only 1! So you now get 11 MPGs.

With unknown plugs, wires and cap Im getting almost 18 MPGs from my 5.2lt
Ron

 

Watch out for those devices that improve mileage.

A guy bought several from JC Whitney - wires, plugs, air swirlers, magnets etc.
Now he has a real problem - it gets too good a mileage - every 100 miles he has to stop and drain the fuel tank! He's always trying to find empty tanks or cans to put it in.