[Bicycle Bob]

Rather than the scan guage, go for a force balance on the bike. For the easy version, pick a day when there's a nice crosswind blowing toward the highway, and ride along the shoulder, towed by a car, a rope, and a fish scale where you can see it. Tuck to minimize the pull, and pedal in too low a gear to keep the power off.

Do not run over the rope, or try this on a planet with lawyers.