Diskarte lang yun... and luck. We lost. The winner did 29.

But here's the thing... we used so little gas on the Eco-run that mistakes at the pump (and we used the same gas pump each time) are possibly bigger than the amount of gas put in! One team complained... they were only at 21 km/l because the gas boy overfilled on the second fill! It's more illustrative to do a full tank test in real world conditions. In other words, empty the tank completely, fill it to the brim, tape it closed, then measure consumption over a week of normal driving.