What is the explosive power of an exploding vehicle?

Enemy vehicles exploding near can apparently cause high, even lethal damage. What is the actual power of such an explosion, is it purely based on the ammo that the destroyed vehicle was carrying or is it a set value?

No idea. I have been killed in my A.33 Excelsior by a friendly 105 Sherman detonating next to me. I think he was hit by a PaK40 or even Dicker Max, can’t quite remember, but it was an AP and not an HE round. Kill feed for me looked as if I bailed, not crediting the 105 Sherman’s killer.