Real apples to apples info using All Terrain tires on an EV SUV and truck. The Rivian R1S and R1T both lose a big chunk of range switching from road to A/T tires going from 352 to 300 EPA estimate (about 15%). That's at the same tire diameter of about 34". Hopefully SM/VAG has enough clout to work with one of the big tire manufacturers to come up with an A/T tire optimized for EVs to reduce that loss a little.
I know from personal experience that the tire compound matters. On my PHEV, I replaced the original tires with the same brand/size/model tires but NOT the EV version because they were more expensive. I lost almost 10% range.
I know I have been one of those wanting 35" tires as an option but maybe the range loss is too severe? I'm hoping SM keeps the Scout size to no larger than a Scout II Traveler (4-door). I think even a regular Scout II with a little stretch and less rear overhang could have 4 doors. A smaller vehicle means the proportions look better with smaller tires. I think 33s still look good on that size vehicle. I definitely hope it's smaller than the Rivian. Even 34" tires look small on it.
Hopefully SM will offer real world estimates of range (including all assumptions) with all the tire/wheel options they offer so buyers will know what they are signing up for when they choose.