My MAN tanks for my auxillery fuel pod run a 13mm vent pipe between the tops of the 2 tanks so I dont need to open both sides to fill.

Therefore based on my 2x220l tanks (which are nearer 235 including ullage)

the formula for the time to fill is

440/7 =62.857142L/Min if I leave the other side cap on and
440/5 =88l/min If I open both filler caps.

naturally theres is slight variance if Im using the high flow bowser that has 2 dispensing sides and someone else is using the other side, temperature of the fuel, the day, if I manually hold the trigger or use the lock on setting 1,2 or 3, if I get distracted talking to the hot blonde and forget to trigger the pump, IF I forget to open the cross flow valve I closed off because I've been off roading and the pick ups only on one tank.


Now, about this extra credit........