I need all I can get out of my Dodge !

 

I have seen a 0-.5 MPG gain. It really depends on what you are doing. You get the most benefit on long highway runs. In town and idle it dosen't help at all.

Thanks,

Jay

 

True. They do have a download for city driving but I did not notice much difference. I do mostly highway driving and there I do see about 1 to 1.5 easily. If I do a lot of city driving it drops off quick. That said I am very happy with mine.