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The "safety" lobby may be pulling this shuck and jive as part of a broader agenda to encourage people to purchase more economical cars, which are usually smaller cars. The elites at IIHS and within the federal government have long been fervent pushers of "downsizing" -- and it stands to reason they'd fudge the crash testing process (or obscure its results, anyhow) to make the smaller cars they favor for us seem more sensible.
But maybe you'd rather pay about more (even a lot more) for fuel if it means your next new car will be significantly more crashworthy. If so, keep in mind that larger is almost always safer.
No matter what the stars might be trying to tell (and sell) you.