i prefer real food.
my favorite to have in the back pocket for a ride like this is a jam and peanut butter bagel, cut into quarters and wrapped in foil.
yesterday i rode 42 miles. fired in half the bagel after 20, the other half at 30. the tank was far from empty at the end of my ride.
if you're finishing rides with that incessant, bottomless hunger then you're not fueling right on the bike.