I'll second the Jeep liberty. Or if you're looking for a used vehicle, I would consider the Jeep Cherokee or an older Grand Cherokee. The great thing about Jeeps are they're quite capable on and off road stock. They have a fair amount of ground clearance, but as mentioned before, they are probably the easiest vehicle to find lift kits and parts for. To solve the poor gas mileage during a bug out, simply buy a roof rack and toss a jerry can on it