I think you're getting good advice here. Pay especial attention to the folks suggesting more protein. It can be a bit counterintuitive -- considering how much emphasis is placed on carbs by the health-club set -- but when you're riding all day you need food that will provide energy over the long haul. The classic road racer's breakfast is rare steak and rice, if that gives you an idea. Trying to supply your body for 6+ hours of effort with PowerBars, carb drinks, and cookies often doesn't work particularly well, as you seem to have discovered. As funny as Hobartlemagne's suggestion of sausage rolls and cheese may seem, it's not far off from the foil-wrapped sandwiches that used to be -- and maybe still are -- a pro road racer's staple.