Hi,
Just noticed this thread...
Your commute is not too different than mine (which I briefly describe in this thread about Wh/mi
http://electricmotorcycleforum.com/boards/index.php?topic=4618.msg32009#msg32009) , but it is a bit longer. I bought the SR with PT because I had similar concerns.
I think you'd be fine with either bike, but would recommend the PT.
I think your temperature warning light will be on quite a bit during that 80MPH leg. That doesn't mean you'll be actually be overheating, but the bike may start blinking at you. Once I've been on the highway for 15 miles or so, the temp has gotten pretty high (200's) and it doesn't take much of a bump in speed or a headwind to get it blinking at me (212 or above). I rarely sustain 80mph. I don't get over 77 or so very often. It just hits the range too hard, and the temperature light make me feel sorry for the bike
When I get home, I usually have about 30-40% power remaining. I think I could manage my commute without the PT, but yours is 12 miles longer... I'm not sure I'd feel comfortable with that. (I'm assuming your figures were for each direction, not round trip.) I am not sure the S would be happy with the 12 miles at 80MPH... Maybe it would be Ok. If not, just slow down a bit. Maybe mine's just tempera-ture-mental.
Sometimes when the weather smiles at me (tailwinds) or traffic frowns (slow traffic in HOV lane) I get home with close to 50%, but that's a special treat. Sometimes it's around 25%. But that's equally rare. Maybe more rare. Usually 35-40%.
Hope that helps.