It does, though, seem to use a substantial window for the milage estimate. You won't get a lot of influence from a two-mile downslope because that'll probably be counteracted someplace in the next 50 mile or so with a corresponding upslope to balance it out.Once you start driving, the range estimate is soon influenced by the driving conditions you are experiencing. The computer’s algorithm creates an "on the fly" estimate of the battery soc to determine the remaining amount of power, adjusts the full charge mileage estimate to reflect current conditions (speed, terrain, weather conditions, etc.), and then calculates the estimated remaining range. When the range goes up while driving downhill, for example, many people think downhill regen is "adding miles to the range," but it’s really not... most of that increase is because the car thinks you’re going to keep driving downhill, and downhill mileage is better than level terrain mileage, so the distance that can be driven using the available power increases. Once you hit level terrain again, the estimated range will quickly decrease as it adjusts itself back to level terrain mileage.