Found the spec on Tesla support page:
Model S Specifications and also on the web site toward the bottom:
Model S | Tesla
- Clearance 5.3"(Dual Motor)*, 5.5"(RWD)*
With air suspension 4.6" - 6.3"
So the "Very High" setting appears to only give less than an inch with a single RWD motor. I also think the low point of the undercarriage is somewhere farther under the car. I also wonder if the spec accounts for Tesla adding undercarriage protection for the battery case?
So being able to drop a single motor variant one inch closer to the ground provides how much more range efficiency? That spec might be a little bit more difficult to ferret out.
*Ground Clearance Reference for Base 75kW, Curb Condition