Thanks! The question was more towards setups with BTs, but this is also helpful.

Note that in the US, doing a full WOT 1 mile+ pull is rare except on road courses (and even then, they're rare - the longest straights don't go that far, and nobody HPDEs on an oval). So it isn't surprising you see both hail mary pulls and hail mary tunes that really only are subjected to 10 sec WOT at a time at the extreme end.

Water meth solutions also don't last long on track, you have to bring way too much meth with you on track day.

Most of us run race gas and race gas tunes when tracking for this reason.

By and large, high hp chasing dyno queens almost never run pump gas either - you'll never get anyone to be willing to "compete" using pump gas. It just doesn't happen.

Understood. Just saying, most tuners are willing to hand off grenades to their clients to win HP dick waving contests, knowing (or assuming) the client won't do anything but street light racing and 3/4 gear pulls on the freeway

No, it is done because of lack of knowledge and doing a shit job.
On Diesel you only have to set a reasonable EGT and IAT limit, that's all there is to it. And by setting correct EOI (most diesel tuners don't even know what that means), you will have better performance everywhere and lower EGT.

Correctly tuned there will not be any difference between the cars performance.
Except one will blow up in extreme conditions and the other one will limit the output at that point and stay together.

This thinking that somehow you need a tune for power, economy etc is complete bullshit done to sell more of the same shit.
ECU has full 3D mapping. ME7 has ways to limit requested load during too much knock intervention/low ignition efficiency and the 1.8T variant even has real closed loop EGT control.
The only excuse for having non-fullthrottle safe tunes is laziness and ignorance, which this thread reeks of.

But see that still does not explain or excuse the high CR stock motors and pump fuel, because if you put the same car with same boost same everything but with lower CR and 10 more degrees of timing at peak torque and so on, which one is likelier to 'win' ?

If that was the way Audi wouldve kept 9.5 CR on the higher HP models too, just boost increase and turbo change.