I'm planning a drive from SFBay to Seattle this coming week or June 22~28 and back in a week or so (both dates are currently flexible). I have an ultra economy 1st generation Honda Insight. This is a 2-seater stick shift with decent room for luggage, rated 62.5mpg on a freeway and although this was before EPA took over the ratings, even if I'm flooring it, I'm still getting around 40~45 and splitting costs will make it x2 more efficient. I'm comfortable going fast or slow whatever you're comfortable with, just so long as I get good company to make the drive less boring and to split gas costs. If you don't drive stick, it's OK, I don't mind driving.
New Carpool 2001 Honda 1 Seat available