A: It depends on how you’re hitting your carbs-per-hour target. A solid approach for the Fred Whitton is to aim for 60–90g of carbohydrate per hour (if you’ve trained your gut for it). If you use gels as your main fuel, that often works out at roughly 1–2 gels per hour. Most riders do better with a mix: ISO MIX in bottles + gels + a bar, so you’re not relying on gels alone.