The ST would have to conform to US crash standards, which Euros do not. Extra cost.
![Frown [:(] [:(]](/images/smilies/frown.png)
They would rather add cylinder de-activation, smaller boosted engines, 20 speed slushboxes, etc., etc. to their VERY high profit margin 'TANKS', in order to meet the CAFE standards with little to no penalties.
![Mad [mad] [mad]](/images/smilies/mad.png)