Nutrition on the road - What, How and Why?

Has Asker Jeukendrup done any research that didn't involve Powerbar or Gatorade products?

Race nutrition vs ride nutrition totally different as your body diverts bloodflow away from the gut under hard exercise making digestion problematic. See triathletes shitting they drawers in Ironmans for details.

Yes, all the research he did before he was employed by them.

They're not totally different - the principle of needing to take on carbs and fluid and not fat or protein remains.