I have also been thinking about what I might want to eat just before my rides now as well (based on some of the above posts).
I seem to have more energy on my weekday "after work" rides which are usually around 20 miles in about 80 minutes. My weekend rides have been in the mornings lately and it's these where I would like to have more energy to get in longer rides - after 30-35 miles I'm pretty beat.
I just picked up a couple different flavors of peanut butter packets from REI to try - they only have 7g of sugar. Not sure if I will like the texture of peanut butter on a ride but open to try.