The new Chevrolet Corvette ZR1 is now the fastest American car around the famed Nurburgring race track. Mustang GTD fans have been reeling since Chevy announced its top models both toppled Ford's ...

The C8 Corvette ZR1X is only 1.5 seconds quicker than the C8 Corvette ZR1 at the 'Ring, despite a 186-HP advantage, plus AWD. So why was the gap so small?