Yes, my 6.7 lost 150 mile range, put very soft rubber NOIKEN HAKKEPELITAS on in October, my motivation was to get off the super slider Firestones.
I expected that, and the much improved traction is well worth it.
this was also my experience with putting on track tires on my M5
It is a well known fact
Rubber has a trait called hysteresis:
"High hysteresis = high amount of Rubber Deformation/Soft Rubber Compound [think racing tires]; High Amount of Traction; but also a High Amount of Heat Generation [internal molecular friction, think of constantly bending a iron bar and the heat produced at the bend point]; and, a High Amount of Rolling Resistance [will use more fuel to overcome this traction process]"