2014 Ultimate 1 Ton Challenge results

Cummins12V98 wrote:
"using the same pump and same filling methods for each, allowing the pump mechanism to click off automatically the first time; then we'd manually fill with one more click after that."

Sorry but that is no way to determine accurately fuel consumption. Same goes for DEF usage.

Then what is your suggestion for how they should have determined mileage???

It doesn't matter whether the tank fills completely as long as it is consistent between fillings your starting from the same starting point each time.