Forgive me if this has been addressed before; I ran a couple of searches and couldn't find anything.
How can tuning for MPG while increasing
performance, as PCMForLess
, and Wait4Me
all apparently claim to do, possibly work? How can somebody hook the PCM up to a computer and do a better job than GM's professional engineers can? I can see that they could choose a different tradeoff—more towing-focused, or more get-up-and-go, or more MPG (at the cost of umph) could work, but that's not the claim that I have seen many times on this site. The claim is that the truck has more
better MPG. If it was that easy, why doesn't it come that way stock? Are these guys smarter than GM's engineers? What am I missing here?