At only 29K miles, it's still a baby! You're robbing the cradle.
Seriously, get some synthetic in the engine, pump up the tires with a little extra hypermilling air, then enjoy a really cheap return flight.
Sure, you can make it on one tank of gas, but I highly recomend finding an excuse to stop once in a while. Snap a few photos with the Insight, check out a restroom or two, phone a friend using a 5 cent a minute calling card. (Don't expect much help from the stereo if the speakers are stock.) I did that distance in 14 hours last summer (besting my previous years drive of 500 miles in 10 hours.). The first 12 were OK. The last two .... a bear. I was so baked, I could barely speak to the Canadian customs lady, who didn't cut me any slack.