Yenko boy

Are mpg's looking the same if not better? Truck run any hotter/cooler?

Thanks for the updates....

Looks massive........... Interested in knowing the results after you drive it please stay in touch . Anthony

Thanks for your input Norway, my truck also has AI375A w/ Allison 6 Combo My truck sits on 24.5 Rubber. I will check into the 12B program and Throttle recalibration but seems after searching further on this site there are tunes that even surpass 12B's performance? But from what I read it's hard to get dealers to upgrade past this program? Also curious about your new turbo injector setup and how that will effect performance and milage anyone have any oppinions on that setup from Rochester Fuel? Thanks... Anthony

Hello all, first I would like to say I did search and found some similar post on this issue but decided to start my own, and not grave dig plus didn't find all info i'd like. I have a 2005 Mack granite dump with 6speed auto love the truck the performance is just fine for what I need but the milage is now killing me. Because of the industry hear in Fl im having to drive longer distances to work and 4.70 mpg is starting to really hurt. I thought I red on here that there is an injector upgrade for these trucks that may help? How about different tunes? Basically im looking to increase this trucks fuel econnomy if possible so any tips in the right direction would be appreciated. Thanks... Anthony