I am looking to install PEV charging station in my garage but I want to be considerate of future changes and future proof what i can. Right now running a line in the basement from the panel to the garage is relatively simple since the basement is not finished yet. My current car is The Chevy Volt which requires the 20 amp line, (leaf requires the 40 amp line) and i want to future proof it so it is ready for the Tesla which i read could go up to 100 amp with the twin charger. Now we may have more than one down the line so I am trying to accommodate that. How much future proofing should i do now, and how much down the road when i get the Tesla?