From the shape of the pre and post upgrade torque curves I would say that you as a driver would need to put zero thought into what you do differently.
Both Torque and HP curves are higher across all RPM bands all the way down to idle in the post upgrade curve vs the pre-upgrade curve. You’d just have more power all the time. Normally, I would call bullshit on a curve that looks like this, but I see that this is a purely electronic upgrade, and that your car is turbo.
I suspect what is occurring here is that the electronic tuning doesn’t do anything until the turbo kicks in, and then the electronic tuning comes in. While I don’t know this for certain, I suspect there are lots of reasons why the car isn’t tuned to the max straight from the factory. Reasons like noise levels, reliability, emissions, and other regulations. Therefore this would leave room for improvement over stock factory settings. So basically, I believe the performance upgrade can be had from this pure electronic tuning.
What I don’t believe is no change in fuel economy. Although, since i’m pretty sure the fuel economy is rounded they could theoretically get away with going from 25.49999 ->> 24.50 and still call it no “change” in fuel economy.
I am not a car expert. This is just a hypothesis.
I think RICK (or garyT?) is a factory trained volvo mechanic and would probably know wayyyy more thne I do.