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No one's going to try to deny that, on like-for-like cars, having more safety features will add more weight, are they?
A 1959 BelAir and a 2009 Malibu have fifty years of safety technology (and maybe more important around two decades of realising safety really can sell cars!) between them that's primarily why one is so much safer than the other.
The opposite situation is shown with the Golf GTI - When it was launched was very light and had a comparatively small (1500cc-?) engine. Twenty years later it has become fat having doubled in weight. Some of this is bells and whistles, but the modern car is a lot more metal.
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