About to press the button on a model s before the price goes up, and having a last minute re-consider of the battery size.... was going to get a 90d, but perhaps 75 is enough? My most demanding use-case is driving between the highlands of Scotland and London. According to evtripping.com, I'll have the same number of charge stops, and the same charge time with either pack. But my margin of safety will obviously be bigger in the 90. Is it worthwhile paying extra for the 90? Have you bought a 75 and wished you'd got the larger pack? If you have a 90, how often do you use the last 20kwh?