“two gallons a mile”
That is pretty bad gas mileage and that is for diesel which is supposed to be better on fuel. So if they have a 40 gallon tank, they can go 20 miles. I wonder if this is more of an hours of operation thing like construction equipment which is rated this way because the mostly don’t do much actual driving.
A German 60 ton Tiger I tank 650 HP gasoline engine, carried 140 gallons, which could take it 70 miles off-road, 120 miles on road.
By contrast the US 33 ton Sherman tank 400 HP gasoline engine carried 175 gallons, which took it about 90 miles off-road, 200 miles on road.
The problem of course, from German perspective, is they have no fuel reserves left, while western allies fuel supplies are limited only by their ability to reach the front.