How much does an army tank weigh?

For the US Army, the average combat medium tank was:

1. 6 tons WW1 M1917 Renault Tank

2. 30 tons WW2 M-4 Sherman Tank

3. 52 tons Vietnam War M-48 Patton Tank (Vietnam War: 17 tons M-551 Sheridan Light Tank)

4. 67 tons M-1 Abrams Tank