Asphaultnaut
Own the Mess You've Made!
I stand by my choice of scrounging a tracked military vehicle like an M88A2 and heading north. Hell, you could hook up a fuel trailer full of diesel if you needed to, but a single take gives a range of about 300 km @ a nice easy 30 mph. Load it up with as many guns and as much supplies as you want and it won't even notice the difference. Can carry 4 crew members comfortably, but easily has room for 8 more people on the back and 2 more inside if need be.
Seriously. M88A2 FTMFW for a zombie apocalypse vehicle.
From Wikipedia:
All you need to steal one is a set of bolt cutters...
I think I'll stick to wheeled vehicles and do the rest from offshore-at least if the Apocalypse hits within the next two years before the foundation relocates/sells her:
http://www.lcs-102.zoomshare.com/files/ship/102.jpg