Pontiac G6 or Dodge Charger for long road trip?

PA to FL -- 800 to 1400 miles, depending on where ends are in each State.

The Pontiac is considerably smaller, considerably better MPG.

The Dodge is considerable more comfortable if you plan on sleeping in the car.

If you care. 

You can go PA to FL in a single day, or you could take two or three days.

Young?  I did L.A. to Detroit,  2,300 miles, in two and a half days, slept first night in the car, a '72 Ford Maverick, a compact, similar to your G6.

Been there, done that, I would take the compact Pontiac.

So after owning both vehicles you still don't know which one is more comfortable on longer trips? There's no helping you decide if you can't figure that one out dude.

The G6 will consume less gas.  The Charger will give you a better driving experience.