[zell66]

Want to purchase a programer for my 2008 F350 6.4, Looking to get better MPG and a towing tune. What are the better ones under 400.00?

 

[karlduke]

I bought an H&S Mini Maxx from 4wheelonline, and I noticed an improvement in my mpg. Since you're on a tight budget, try to find a used one. Other good tuners are SCT and Spartan.