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Originally Posted by Turret
Could a common variety modern car do such a thing? Older cars would have been less efficient I suppose.
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Fuel tank size is a design decision. Most modern cars could easily fit in much larger fuel tanks than they have, though this would cut into the amount of space available for other purposes, such as space available for passengers and cargo. However, most people are willing to accommodate a smaller fuel tank and instead visit fuel stations more often.
In WWII tanks, there was no intention to accommodate passengers or cargo inside. Rather, the designers tried to cram into a tank big gun, lots of ammo, thick armour, powerful engine and lots of fuel. Those WWII tank fuel tanks (no pun intended) measured in hundreds of liters (some modern tanks having over thousand liters of fuel). On the other hand crew compartments could be cramped, and any extra cargo would be usually carried somewhere outside the vehicle.
Scenario-wise, you could try modelling limited fuel supplies by reducing movement rate for the vehicles with limited supplies, to represent tank crews being more conservative with their fuel.