Since I've only owned my Roadster for about two weeks, I don't yet have any experience about reaching close to the maximum range. However, this Saturday, I want to drive it 140 miles (70 miles each way) with zero chance of being able to charge it along the way. My car just had it's annual service with Tesla and they reported everything as being in great shape. My 'ideal range' on a full maximum range charge is reported as 212 miles. In that same state, it reports a usable range of 165 miles; which is 25 miles further than the 140 mile road trip I want to take. This sounds like it should be safe..but..I assume there are numerous variables at work. This 140 mile trip will be almost entirely on the freeway going 70mph. Based on your experience driving your roadster within 20-30 miles of it's reported usable range, does this seem 'safe' to do, or am I likely to end up getting stranded a short way from home? Also, I know there is a 'range' mode for charging, is there also a 'range' mode setting for driving as well?