I'm in the process of planning a trip from Hamilton, ON to the Annandale, VA... My longest leg is going to be from Erie, PA (an overnight stop at a hotel charging on L2) to the Somerset, PA SC. Google maps says 299km. Sounded doable on the surface, but the more I look into the #'s the more I have my doubts. Right now it looks to be a high of -4C on the day I leave (with a low of -8C). I went with an avg temp of -6C or 21F. Chad's sticky in the battery&charging section (Putting some numbers on the factors that affect range) says to add 25% in energy usage at 15F... I punched in that leg of the trip into http://www.jurassictest.ch/GR/ it says to expect 226Wh/km @ 100km/h. Adding in 25% gives me 282.5Wh/km. Usable energy in the battery appears to be 75.9kWh (how i reduce my cold weather long distance range anxiety - Page 2) so I'd need to average 75900Wh/299km = 253Whkm to not deplete the battery. Working backwards to stay under 253 Wh/km I'd have to drive 83km/h using jurassictest #'s + a 25% cold weather penalty. I'm thinking that taking the minivan is a better idea for this trip (as much as I hate the van). I don't want to be killing any time at L2 chargers, as I've got 3 kids and the youngest is 22 months...) Are the jurassic test #'s pretty accurate? (I changed the weight of the S from 1950kg to 2086kg and added in 3 75kg passangers...) Is 25% cold weather penalty too high, or is that a good conservative # to use?