I'll have to echo this sentiment. Passengers who are aggressive or backseat drivers themselves and want to get somewhere ASAP, the 250-300 mile trips can be annoying only because of the possibility of that passenger pushing you to leave without as full of a charge as you might like. It's actually funny to think they know better than an actual owner. So I'd have to say: MS owners, be wary of who you take on a road trip!
I took a trip from Garden Grove to San Diego (~100 miles) yesterday in my 70D. Fully charged before I left registered 236 rated miles on the dashboard, and by the time we were ready to leave San Diego, I arrived at the SD Supercharger with about 30 miles remaining. 15 minutes later it had charged up to about 120 miles, and one of my passengers insisted I'd have enough to get home.
Instead of trying to explain that 120 miles on the dash is probably more like 100 or 110 depending on how I drive (he's an aggressive driver and kept urging me to basically "floor it" every chance I got), and considering no one knew how far it actually was back home (we had decided to take side streets to avoid the freeway traffic), I just said for peace of mind, let's stay here for another 5-10 mins.
We charged to 150 miles at the Supercharger, and by the time I dropped everyone off and arrived back at my house, I had close to 30 miles remaining. Meaning, if I had listened to him and left the Supercharger at 120 miles on the battery, I may not have made it home.