I'm not a tanker, but I think I have found the numbers you're searching.
Curious system, the VEESS. I did'nt know anything about it before your post, but after little searching, it seems quite a good system to screen a vehicle.
I’ve found the link below:
http://www.globalsecurity.org/milita...12/Appg.htm#p3
Under “Smoke defense†you will find:
“The VEESS consumes approximately 1 gallon of fuel per minute of operation. It can only be operated when the engine is runningâ€
Talking in Twilight terms, I suppose that this system must be limited to diesel engines and it could not be used in vehicles burning methanol or ethanol, due to the risk of an explosion.
Arreveure!