In March 2018, Obree tested another replica of "Old Faithful" in the Mercedes-Benz F1 team's wind tunnel to gauge the aerodynamic efficiency of his various riding positions on the bike, having never previously participated in wind-tunnel testing before. It was found that the (drag coefficient) of Obree's initial "tuck" or "crouch" position was 0.17, compared to a conventional 1990s bike position of 0.20 and a modern conventional position of 0.188, leading to an estimated gain in speed of about 2-2.5 km/h over his rivals in the 1990s and a gain of 1.5 km/h over contemporary track cyclists: meanwhile the "Superman" position was found only to be marginally more efficient than the 1990s conventional position, and less efficient than the modern conventional position. Obree however noted that the discomfort of the "crouch" position takes a lot of energy out of the rider through holding the hands and shoulders in place, whilst the "Superman" position was much more manageable.