It's worth noting that in some of the tests, vehicles are run into a rigid barrier or hit from the side with a fixed weight vehicle, and in others, they're collided with a vehicle of equal weight. Having more mass does (generally) have a positive influence in crash tests.
What I found interesting, reading about it this morning, was that crash tests more recently simulate more SUV and truck impacts (higher up with rigid bumpers), rather than sedan-type impacts, and these are found to be far more deadly for the occupants of other vehicles. It really is an arms race.
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