I suggest you look at the tire rack review
that directly compares the MXM4 T1 (Tesla spec) vs Crossclimate 2. In this review they measured 27 Wh/mi increase in consumption using the Crossclimate 2 (11.4% increase in energy consumption).
In reality you should not think of energy consumption from tire rolling resistance in terms of % as it is mostly fixed nominal energy as it is determined by rolling resistance coefficient (mostly fixed other than driven surface) and weight of the vehicle (also fixed other than adding luggage/passengers). So when travelling at low speeds, rolling resistance will be a higher percentage of energy consumed vs high speeds where energy associated with rolling resistance is lower percentage (coefficient of drag dominates at highway speeds).
Based upon the increased energy recorded from tire rack test (27 Wh/mi) you can calculate the increase in rolling resistance coefficient (Crr) for the Crossclimate 2 if you know the weight of the vehicle. M3 LR has a curb weight of 4065 lbs and will assume an additional 200 lbs for driver + misc equipment (4265 lbs total).
(27 Wh/mi )/((4265 lbs)x(1.989 Wh/lbf mi)) = 0.0032 or sometimes represented as 3.2 kg/T
Now Tyre Review has a YouTube video
that compares PS4S, PSAS4, CC2 and X-Ice Snow and lists the rolling resistance of all four tires at time mark 9:50.
The CC2 has a rolling resistance listed at 10.1 kg/T so we can assume MXM4 T1 rolling resistance is probably 6.9 kg/T. The PS4S is listed with a rolling resistance of 9 kg/T so you should expect approx increase of 17.8 Wh/mi when driven on similar surfaces used for tire rack test. One word of caution with these values for Crr is Tyre Reviews does not specify temperature or surface type that these rolling resistance values are determined for. I suspect it is at 20 deg C and concrete road surface considering the summer tire PS4S has virtually the same rolling resistance as all season tire PSAS4. I would expect the PS4S rolling resistance to be closer to the CC2 when driven in the summer (30 deg C) on asphalt covered roads as summer compounds increase grip substantially with heat.
I am currently looking at the Pirelli P Zero Plus Elect for replacing my MXM4 next summer as I am down to 4/32 thread depth after only 28k km during summer driven mileage. Most reviews indicate Pirelli has a slightly higher consumption over MXM4 but this is probably due to higher starting thread depth (10/32 vs Tesla spec MXM4 at 8/32). The Pirellis are also substantially cheaper than the Tesla spec MXM4 (25-35% cheaper).