Hello. I have a 2013 85 Model S. I drive 8K mi/yr, but do go on a few trips. Getting ready to order a new model S. I want to decide between 60 and 75 batt. pack. The 75 kwh pack is another like 8 or 9K$. Is a 2016 60 kwh pack equal to say a 2013 75 kwh pack? If the 2016 packs pack a given percentage more energy, I will just go with the 60 kwh. Also, I plan to fly from San Diego to Fremont to pick the car up so I can get a factory tour. Will I have any problems getting home in the smallest battery Tesla offers? Thanks!