tankillinen
Tankillinen is a Finnish term that translates literally to "a tankful" or "a full tank." It is most commonly used in the context of vehicles, referring to the amount of fuel required to completely fill the fuel tank of a car, motorcycle, or other motor vehicle. The price of a tankillinen can vary significantly depending on the current fuel prices, the size of the vehicle's fuel tank, and the type of fuel being purchased (e.g., gasoline, diesel).
In everyday conversation, Finns might say "tankillinen bensiiniä maksaa X euroa" which means "a tankful of gasoline