I'm planning out a road trip between Columbus, MS and Oklahoma City. There is a 370 mile supercharger gap along I-40 between Little Rock and OKC. Luckily there is a destination charger in Russellville, AR and we were planning on spending the night along the way anyhow. My question is this: is it reasonable to do the 270 interstate miles on a 100% charge? I highly doubt I can do the 75mph speed limit along I-40 through Oklahoma. What speed should I trip plan at? 65mph steady? We'll be departing around 6AM so Air Conditioner won't be running too hard.