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Best tuner for 05 Duramax to increase Milage??

4K views 8 replies 5 participants last post by  Dan"gerous" 
#1 ·
Sorry guys, I realize this is Ford country but a buddy (misguided lol) purchased an 05 Duramax and isn't impressed with the milage. Knowing nothing about the Duramax can anyone direct me to the best tuner or chip for it?
 
#4 ·
X4 go with EFI live
 
#9 ·
Thanks everyone. I'll pass along the info.
 
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