I plan to travel a lot in my Model S when it arrives (the first summer already has nearly 10,000km earmarked :love and much of that will be highway travel. Perhaps I'm simply impatient, but I cannot stand traveling in convoys (many cars following close behind a slow-moving one to form a tightly-packed, slow-moving line). If presented with the opportunity to pass/overtake someone safely, I usually take it. I expect this will be quite easy in a vehicle as powerful as Model S. Unfortunately, I expect each passing effort will have quite a negative effect on my overall range. Math fanatics rejoice! I would like to estimate just how much detriment I do to my range each time I pass a vehicle (or even cumulatively over a 100-mile section). In a P85 Model S, 10 seconds at full power should be all that's required for a single-vehicle overtake, followed by 5-10 seconds of regen at 30-50% capacity. On a long trip with heavy traffic, I can see myself passing someone at least once every five miles. Work in the occasional multi-vehicle overtake (say 20-30 seconds at full power, followed by appropriate regen). The broad factors affecting range (temperature, speed, weather, etc) have been discussed in other threads, but I don't recall any discussion of specific-use effects such as overtaking. If I am mistaken, please direct me to the appropriate thread. Thanks.