I have a 06 western star with a series 60 515 horse detroit 18 speed 307 rears and low pro 22.5's On our last quarter IFTA fuel mileage average it was 5.98. This [economy with power] program was installed on or about 5-1-2008...I felt I needed the top program...and immediately seen fuel mileage increase up to 7/10 a mile to a gallon...I run west coast out of Pa area... Although I have not ran for a full quarter to get exact average mile per gallon figures, I do calculate my fuel mileage between fill ups and my average will be 1/2 to 7/10 increase and very much enjoying my Big Dog status. Thanks again...for these programs and bringing a smile to my face.

Downloader is wonderful. The installation was a piece of cake. Seeing 1/4 MPG improvement with the economy with power setting installed after 2 months.

I have been running the Bully Dog Power plus Economy on my 04 Freightliner Century Detroit for about 6 months now. I am very pleased with the results. After installing the program, I experienced an immediate increase in fuel mileage of about 3/4 of a mile to the gallon. In fact, my fuel mileage used to run in the 6.75 to 7 mpg range with the best I could get being about 7.27. I now get 7.75 to 8.25 depending on conditions. I don't haul heavy loads, but the load I haul have a lot of little wind grabbers that really play havok with fuel mileage and performance. I even think the engine runs better with the Bully Dog progam installed. I have told a number of people about your program and will continue to spread the word. Best of all I won the Bully Dog program on your website in a random drawing. Keep up the good work!

I installed the Power Pup about three weeks ago on my '07 Detroit. I pull a 53' step deck trailer. The loads are ugly from steel beams to tractors, and the wind drag from the loads varies significantly. Since the installation I have pulled 5900 miles. The Power increase is obvious. I've done some testing and there is no doubt that the engine is running more efficient. In Ohio I put it on cruise at 55 mph, which is right at the very bottom of the range it will run in the top gear. There are some rolling hills and running that stock in the past would have required down shifting to go up and down those molehills. With the economy tune install it ran like a champ and didn't have any problems going up and down those hills in high gear.

I then ran into West Virginia and there is a two mile 6% grade mountain that will definitely put an engine to the test. I put the truck in high gear on my 10 speed transmission at 65 MPH and up the mountain she went. We hit the summit in top gear at 57 MPH. Then I pulled off, and retuned the engine back to stock. Turned around and ran back up the same mountain with the same load at 65 MPH. I didn't make it 2/3 the way up the mountain before having to shift down. I then reinstalled the economy with power tune from the Power Pup, turned around and ran back up the same mountain and once again we climbed the mountain in high gear and topped the summit at 57 MPH. I ran all of the tests, setting the cruise to 65 MPH so there was no chance that my foot had a roll in how the truck pulled up the hill. I call this my poor man's dyno and there is no doubt that you are adding an extra 70 hp and 200 lbs. foot of torque. The cool thing is, I haven't noticed any difference in my pyro temp from stock, plus I've gained a full gear in climbing.

After running three weeks it really isn't long enough for me to know exactly what the increase in fuel economy, since I haul so many different sized loads on different routes. This much I know, the fuel economy is the best I have every gotten out of this engine running 5900 miles. I know it has definitely increased my fuel economy and I'm guessing that after the end of 6 months I will be up between a 1/2 mile to 1 mile. I was very skeptically that this product would do what Bully Dog claimed, but I'm a believer now. Thank you for this great product.

I drive for a regional fleet. The truck I drive has an '03 Detroit Series 60 engine. This truck has been kind of a guinea pig that my employer has used to try different products that claim to improve fuel economy. None of them have worked until they tried the Power Pup. Initially they didn't tell me that they had installed anything on the truck, and that is a good thing because they didn't want me to change my driving habits because I thought there was something on the truck. However I could tell that the truck had more horsepower right away since they installed the economy with power tune, and it wasn't hard to figure out that something had changed on the fuel economy side either. I run a dedicated run that is 1025 kilometers long. Before the Power Pup was installed I would put in 580 to 590 liters between fill ups. With the Power Pup installed I am consistently putting in 515 to 520 liters of fuel. I've been running it long enough that I can say that I'm consistently saving on average 70 liters a day in fuel. The fuel savings were dramatic enough that the owners are installing more units on the other trucks in their fleet. We are all pretty happy and impressed with the results.