Or, before you have been separated, you can choose any specific point on ground, as a joining zone. Of course i dont mean about point like tower, or building, but area which is well seen from air, for ex. lake, mountain, river, road, city, etc.
On indicator in cocpit - yes; in russian machines in kg/h.
But i mean about manuals and specifications. For ex. manual for CESSNA 152 on pages 5-2 to 5-4:
http://www.micro-tools.net/pdf/Cessna/152_poh_79.pdf
Sometimes tanker-man takes you invoice with information how many kg of fuel was given into containers. Usually it refuels full, so you know it is 24.5 gallons.
In aviation world it is normal that the quantity of fuel is in kilograms or pounds. It is very important to know how heavy is your plane for start and landing procedures. But, in other hand, the consumption of fuel is given in gallons or liters per hour. So, pilot during his prepare to flight have to convert f.ex. kg to l, or he uses FMC.
At the ending of this Tacview file there is show of abilities R77, which tryied to hit me. I was hitted by one few seconds earlier, and was falling down in a spin. The second misissle was drawing nice circles near me. So, maybe a spin is good manoeuvre to avoid R77 :pilotfly:
http://www.mediafire.com/?i5znby2fww3