Re: Laptop power in the car
A DC to DC supply would probably still require a voltage change since most car battery systems kick out an unregulated 10-14VDC to the cigarette lighters/DC power points. It's been a while since I've worked on them, though, so it's possible newer autos have cleaner voltage regulation.
Personally, I'd just go for the inverter. You can use it for other things (like charging your camera batteries) and it's really only a "bit more" power consumption in the long run. Especially since the car system is recharging all the time anyway.
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