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Bienvenue, Benjamin!
I've changed your account so you can now post links/pictures.
As for your question about tires:
If the old tires are NOT low rolling reisistance, then you will notice a big difference in how easily the car coasts in neutral. That can save you a few percent in your fuel use. It can save you MORE than a few percent if you can change your driving techniques to take advantage of opportunities to coast longer before turns & stops. (Depends on traffic, too.)
Torque mapping:
As for changing engine characteristics, my feeling is that would be most useful if it allows you to change to top gear sooner than you can now.
Similar situation: I installed an "economy" camshaft in my gasoline engine that makes more low-end torque, so I can up-shift earlier.
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