How mutch Gas needs a BigMax 2-Stroke in 1 hour?

[Bavaria]

Engine is a 440 Kawasaki 2-Stroke. My Gas-Tank is dead. I have to look for a new one. Hard to find. Now i see a smaller one. He have just 7 Liter . How mutch trinks this engine in 1 hour when i drive him not on a trail ore on a trail?
kind regards
Frank