You never really get all the range anyway unless you want to accelerate the degradation of the battery. Think more of like 70% of the rated range (10% SOC to 80% SOC). A lot of supercharger use will accelerate the wear.
I watched an interesting Youtube vid where 2 guys were on a trip, one in the MYP and one in his M3 LR. On about a 5 hour trip, it turned out the MYP took and extra hour or so. They were fine for the first few supercharger stop and stopped pretty much the same with the MYP taking more juice. But one through I think it was Nashville, the MYP couldn't make it and had to detour about 30 min away to as SC to make sure he would have enough energy.
They didn't plan it that way, but they were both surprised what even how impactful that rang difference was on even a short trip. The faster you drive, it is going to be even more significant. According to Edmunds, they said the real world range of an MYP at 100% SOC and driving 75 mph is only about 260 mile until it is totally out of juice. So for most people, that might put you a bit over 220 if you want more of a buffer. If keeping it in the sweet spot of battery health, you end up about 182 miles (using 70% of the charge).
When you start looking at it through that lens, I'll take the extra range and a reason why I ordered an MS as hopefully I can get closer to 300 miles real world range. Around town 180 miles is probably good for most people.
So between LR and P, its really a 8% difference, so with that 182 using 70% of the range, youre looking at ~195. so still not a major difference, maybe a couple mins of supercharging diff on long road trips