To move oil and fuel, to keep all the different fighting vehicles moving. And to get fuel to the civilians, keep all those vehicles moving too.
heavy fuel oil can be ssed instead of diesel.
such heavy elements as plutonium or uranium.
Diesel
Heavy fuel oil is primarily used in industrial settings and power generation plants to produce heat and electricity. It is also used in large shipping vessels as bunker fuel for propulsion. However, heavy fuel oil is becoming less common due to its high carbon emissions and environmental impact.
Lots, because a train is heavy. A 500 gallon fuel tank is small. BUT ... the amount of fuel used to move a ton of freight is roughly one quarter what it takes to move it by truck (and a tenth of what it takes to fly it).
Cruise ships run on diesel fuel to power generators while in port, and heavy fuel oil while sailing.
it's fuel used for the refrigeration unit on heavy trucks - like 18 wheelers or other over-the-road units
Air Force Tankers such as the now obsolete KC-97 and the still in use KC-l35 are used to refuel tactical and strategic aircraft in flight. the tail boom operator is the Key Man here. there are more advanced models of aerial tankers, owing to the risks involved, this practice is confined to the Air Force, the Navy does not use aerial tankers, unlike the maritime type- sometimes called Fleetlines a shortened form of fleet lifelines. these are used for Underway refueling. (of ships)
No, nuclear reactors are currently too big/heavy to put into a car.
Bitumen is not commonly used as fuel in ships. Ships typically use marine diesel or heavy fuel oil as fuel due to their higher energy density and compatibility with ship engines. Bitumen is more commonly used in road construction and waterproofing applications.
That is dependent on how heavy it is. Full thrust requires the most fuel. Too many variables to answer sufficiently