Just wanted to share on my 2005 aveo stick shift, my record is 450, yes, 450 miles to a tank. That was going 55-60 mph from California to Arizona which is actually an increase in elevation, coming to roughly 42-43 mpg's. THis was in the dead of night with no AC on, and following large groups of semi trucks most of the way.

I regularly get 365 miles to the tank, freeway driving, going 90-95 mph to work, and 60 mph on my way home. It is 85% highway driving.

When I lived in the city and commuted in crowded streets, I would still get around 315-330 miles to a tank, driving rather aggressively.