I leave my phone plugged in overnight, and when I get to work, I have it plugged into the USB drive on my computer. On the occasion where I'm driving, I've got

I leave my phone plugged in overnight, and when I get to work, I have it plugged into the USB drive on my computer. On the occasion where I'm driving, I've got an Alpine stereo with an iPhone adapter, and a mount for my phone, so I leave it plugged in there. I haven't done any hard numbers, but my battery capacity doesn't seem like it's worn down from when I got the phone over two years ago. Nonetheless, there are definitely more important things to worry about whether you're looking to cut back on your electric bill, or are trying to be more 'green.'