How safe would a plastic car like that be in an accident?

You could buy a car that was made of paper mache, too, and it would get would get really good gas mileage, but is it worth the risk of what could happen to you in a bad accident if you were in it?

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1991 560 SEC AMG, 199k <---- 300 hp 10:1 ECE euro HV ...

1995 E 420, 170k "The Red Plum" (sold)

2015 BMW 535i xdrive awd Stage 1 DINAN, 6k, <----364 hp

1967 Mercury Cougar, 49k

2013 Jaguar XF, 20k <----340 hp Supercharged, All Wheel Drive (sold)