Thinking of driving my Model S 60 from Atlanta GA to Rosemary Beach (in the Florida panhandle). I would charge up at the Macon GA, and Tifton GA superchargers (waiting for a full charge in Tifton). From Tifton to Rosemary Beach is 209 miles, mostly on 2 and 4 lane country roads, with some period of time on Interstate 10. I was thinking that if I drive 50-55 mph and don't blast the A/C, I should be able to make the last leg of the trip without charging. (Doing some testing at 50-55 mph around Atlanta, I seem to average about 250 watts/mile.) The terrain from Tifton to the panhandle is flat, and on my travel day the weather is predicted to be clear with temps in the mid 80s. If energy range does not look good along the first portion of the trip from Tifton to Rosemary, there are a few Nissan dealerships along the way where I could plug in for an extra 15-20 miles range. Thanks in advance for your thoughts or advice.