CM870

[Chamberpains]

DLC i'm sorry to say your words are comforting but completely wrong. There are many demandates that cause silent derates, simply have the check engine light shut off (not the actual code, which is also wrong), and a plethora of other horrible calibration changes that work against the engine running properly under all conditions it can be presented with or conditions which it was originally designed to handle.
There are very few people out there that have and use the knowledge to properly program a CM870. How do I know? I was one of the blind fools that let someone do there quote unquote professional Delete. Which sent me down a 4 year path of learning everything and anything I could on these engines. I have seen 1st hand some of the lame demandates that companies and individual on the web recommend and they're all half @$$ and will cause very poor running and eventually a premature destruction of the engine because it's blindly working against itself.
Just because you don't have a check engine light or a noticeable derate doesn't mean the engine is running anywhere close to peak performance. Mine ran for 3 years with a crap Demandate. Now that I've had it corrected properly I can now see exactly where the wrong Calibration made things run poorly and under what conditions they occurred.

I can tell you also that Scanguage isn't all the parameters you can monitor on your engine and is definitely not accurate to what the ECM is seeing. A lot of Scanguage's number are of it's own calculations. Such as Torque load, Horsepower, Boost pressure, MPG and GPH of fuel use. If you want more acurate monitoring, you will need other software such as Insite or more effectively C@1t3rm.

I'm not trying to Sh1t on your parade. I'm just trying to keep a very real knowledge based view in the conversation for this guy to make accurate decisions. I also use a Scanguage KR (which I think is crap but good for some things) to monitor a few parameters to keep me under control for maximum fuel mileage for my operation.