it is very difficult to say exactly how much mpg or performance an ecm & ficm rollback is worth, there are so many ecm and ficm calibrations out there for these trucks, some are good, some are ok, and some are bad. the gains from rolling back are entirely dependant on what the trucks current calibrations are. in other words a truck with good ecm and ficm calibrations isnt going to gain as much as a truck with terrible calibrations.
That is where Bill comes in. he is very firmiliar with the calibrations for these trucks and will be able to tell whether or not your current calibration is good and if there is a better calibration you can run instead.
I can tell you from what i know that VXAP2N2 is TEC7 and it is an inferred EP calibration. The inferred EP calibrations are not as desirable as the older calibrations use the EP sensor feedback for engine controls.
the major contributing factor to what gains you will see depends on what your current FICM calibration is. the ecm calibration and ficm calibration go hand in hand. it is a good idea to flash both modules if you are going to roll the ecm back.
the desirable FICM calibrations offered great fuel economy and performance, however they did not include inductive heating for cold starts. bill takes the best ficm calibrations available and addes inductive heating to them to make them cold start friendly. there are more details but those are the basics.
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