Most guys who swear by their email tuner,have nothing to compare his tune to,so they're assuming they got a tune specific to their truck,which is about as far from the truth as you can get.Unless that tuner is sitting in your pass seat with a laptop on his or hers lap,you're just getting a generic tune.
The Master Tech we had at Big O Tires knew what he was doing and tuned Rams every single day, he had a 2004 HEMI and he showed me how to tune the shift points on HEMIs back then.. nothing to complicated really ...
The fuel economy tuning is a bit more complicated and I think that is where they are all just copying each others tunes and just making a few changes up and down not understanding the effects it has on the sensor banks .... they don't understand the meaning of running to rich thus causing the hard shifts when letting of the gas ... they don't level things out and spend time on anything themselves like you said not being there inside the truck with their laptops and actually making runs themselves ...
So many things are going to affect the 02 sensor and air flows and the STOICH .... I have seen some tables with the STOICH set as high as 20 and as low as 3 ...WTF !!! ...14.7 is perfect AFR for these trucks from my understanding lol ...
Anyways ... I want to get into tuning myself but don't feel like spending the money right now on software and an unlocked PCM just to mess around with it ... I don't have the time to do so and if I start messing with it I will start tweeking on it like a methhead lol ...
But as soon as my trucks warranty is done I am going to start messing with this truck more ... I knew how to tune Hondas and Acuras but that was years and years ago ... these HEMIs are similar but still different having the 8 speed tranies ....
But yes, these guys are selling canned tunes and copycats off each other and calling them their own, just like in the detail industry where white labeling is becoming the thing right now, everyone is finding a blending company to make a few changes on detail products that are already proven and all they do is change the color and or smell and slap a white label on them and call it their own product lol .... same thing with these tuners ...