I find the new maps to be less optimistic on the available range for a trip. When driving from home to work using the old maps, starting with a 75% charge (S100D), would predict an arrival with 26% charge (180 miles). The new maps predicts arriving with 21% charge. That's about 10% more pessimistic by my calculations. The actual usage was unchanged from before, but it errors on the side of caution for the initial routing estimate now.
Pessimistic or Realistic? The traffic and weather conditions do tend to have an impact on battery consumption. Not sure if it takes that into account too now.