[The Cummins Power Pup] Works Great! Improvements are 1 mile to the gallon, real improvement, the pulls are better on hills and smoother. At first fuel mileage was up 6.3 and now is consistently up 4/10 to 6/10.

It's definitely worth the money to get one and I'd never go back to not having one. It's like driving a completely different truck.

Put the power pup in my '08 KW with an ISX 600 four months ago. The power increase was amazing, but it did its regen every day. Didn't see real improvements in fuel mileage until about 2 months ago when it did a very hot regen and burned some of the DPF out, runs alot smoother now too. I'm averaging 5.8 mpg, over a mile a gallon better than before.

I'm really pleased with the way it's doing. I didn't talk to anyone else before because I wanted to do my own checking. With the economy with power loaded I have seen no change in any of the temps on the truck. What I have noticed is hauling 81,000 lbs climbing a 6% grade I usually get to the top lugging at 31 MPH and now I'm climbing the same grade at 41 MPH.

When you are running and pulling it feels like the truck is running easier and doing the job better. Anybody that I talk to is going to get nothing but a positive attitude from me about it. I like the way my truck runs and I'm real pleased the product. Thank you.

I've got a 2008 Pete 379 with a 550 Cummins. I'm very happy with the Power Pup. I've tried both the economy and the power setting. The economy setting did virtually nothing for me, but the power setting has worked no question about it. I'm saving about 3 liters per 100 K which works about to saving me about $300 a month. The thing that impressed me the most was it brought my winter fuel mileage almost to over where my summer fuel mileage is.

I installed the Power Pup around January 2010. I'm running trains up in Canada pulling 139,000 lb. loads. I've gained 1/2 to 1 gear in the hills. I just love the torque feature on it. When I hook a gear I don't have to put my foot into it. I just drive off the manifold pressure gauge. If I keep it at 20 lbs. instead of in the high 30s like I did before I installed the Power Pup it will take off like a jack rabbit.

I have a DPF system on my truck as well. I believe that Cummins recommends that you get them cleaned every 3500 hours. I went 5500 hours and the tech that took it apart said that he had never seen one this clean. I know if was because of the Bully Dog on my truck that it was like that. So all the way around it was the best $3000 that I've ever spent on my truck. I'm very happy with it and won't be without it again.