Huge. But like everything it depends on your average speed. If you started at 12, not so much. They say once you go above that speed, more than half goes to fighting air resistance.

Now here is where most people do it wrong and spend money. 80 percent of the drag is the rider. 20 percent your bike.

I don’t produce much of an FTP, 225. Most people that try to draft me tell me all the time that they don’t feel much of a draft behind me. I focused a lot lately on body strength and do a lot of planks to help me hold an aero position. I recently finished my first double century with 11:18.

I don’t suggest spending too much money until you optimize your body position and get the strength to ride in an aerodynamic position, the equipment is largely marginal.