Quote from Jill in Tanks for the Memories
Lt. Col. McDougal: There are four fuel tanks on the M1 A1 that hold a total of 504 gallons. Tim: Whoo! I hope you have self-serve. What does this thing weigh? Jill: I'm guessing 65 tons. Tim: No, no, no. It's gotta be more like a hundred tons. Lt. Col. McDougal: Actually, the curb weight is 67.7 tons. Very impressive, Jill. Tim: She grew up on a military base. Jill: I always loved tanks.