Looking at the mileage estimator Tesla used to have on their website, checking the range of a 70D. On a nice day (70 degrees), range at 80mph was about 200 miles; range at 55 mph was about 300 miles. I'm really rounding the numbers, but the difference to me is big! Would I really get about an extra 90-100 miles by slowing down that much? I've read that on a trip "the faster you go, the longer it takes" in a Tesla, since higher speed gets you to the SC sooner, but you have to spend more time charging. Seems like driving at a moderate speed has a lot of winners with no downside: safer; less stressful driving; more time in your comfortable, fun car; significantly less range anxiety; total trip time is the same.