First of all, hey there, new here to the Prius chat! Our family has just purchased a 2010 Prius II, and we are taking an extensive trip out west with it. We want to use the Prius battery via the cigarette lighter to recharge our laptop's battery (ONLY while driving, not while it's parked). It's a Toshiba Satellite L505 and gets about 2 hours of life on a six-cell battery. I was wondering what effect this will have on our Prius' battery power while traveling. Will it be any different if i recharge around town or on the highway? And will it cause the car's battery to run down while driving or after stopping and restarting the car? In other words, how much pull will it be on the battery? And while i'm thinking about it, will doing this also affect my gas mileage while having the laptop plugged in? If so how much? If you're not quite sure, a ballpark figure would be ok, it's important. Thanks very much in advance. I can provide more information if necessary, if i have it. Great to have this chat.