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That got me interested on fuel economy. According to this webpage, a M1A2 has a gas tank size of 1907 l (505 gal) and a cruising range of 426 km (265 miles).
That would make 448 l/100km (0.52 MPG). Wow.
The site also says
A tank will need approximately 300 gallons every eight hours; this will vary depending on mission, terrain, and weather. (1364 l)
0.6 miles per gallon.
60 gallons per hour when traveling cross-country (263 l)
30+ gallons per hour while operating at a tactical ideal (136+ l)
10 gallons basic idle (45 l)
A mine plow will increase the fuel consummation rate of a tank by 25 percent
Probably you are right with the latter. A cement brick house easily has 100 tons CO². And in war, whole cities get destroyed. Plus destruction of enemy energy infrastructure, like oil fields, if existant.
Kind of sad now, when I think about it. Looks like we rather destroy the enemy with us, than having somebody we don’t like rise above us.