Join Date: Jan 2009
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For mpg, the best thing is to slow down.... for power EFILive is the way to go ... the predator in your signature is good too. I have not seen drastic changes in mpg with programmers or harness boxes (I had an edge EZ - very simple, good power, but mpg wise I only gained maybe 1 or 2 mpg overall ....) Slowing down allowed me to gain more .... 55-60 mph is best versus above 65 mph where the mpg goes down fast.
The Edge EZ is very simple to install (plugs into harnesses between your PCM) and you change power levels with a switch. The Predator loads a program into your truck, so switching power levels requires some effort, and from a reliability standpoint there is nothing more to go wrong (the Edge could fail .... whereas with the Predator you are relying on your PCM only ....)
EFILive will let you create whatever power/mpg tune you can dream of, but the learning curve is steep.