[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.

RMC Transport has gained four to five tenths per gallon better. They also have gain a gear pulling long grades.

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.

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