JP Mag (rag) has only bashed the KJ from day one.....cancell your subscription !
I've got a great deal for you....send me only 1/2 the price and IMAGINE that your getting better gas milage ...what a deal !!!!
no...seriously, I just read an article in consumer reports about a number of different "devices" that made lots of claims and delivered no good results. Some of them actually decreased mileage and performance!
It might be better to buy a nice heavy skid or roof rack and decrease your mpg...but enhance your Jeep. You could get a really nice 2 meter Ham Radio for that....or maybe a set of lights or a Power Tank .......or who knows !
Good luck though...
ps.....cancel your subscription to that KJ hating rag. (just my 2 cents)