If the had just set both vehicles on level ground and hooked up power to the fuel pumps and ran the tank out thru an orifice until the back pressure dropped it would have helped. Due to slight changes in the pickup assemblies one truck might have been able to pick up an extra ~gallon of fuel. When running the test if they monitored the fuel rail pressure and stopped the test when it dropped some specific amount it would have made it more even.

They did at least run both vehicles around the track at the same time.