It all changed on December 19, according to Cadillac General Manager Jim Taylor. That's when President Bush signed the bill that made increased CAFE standards a reality. The revised fuel economy requirements mean that the days of widespread V8 power at Cadillac are all but over. This all dovetails neatly with GM's announcement that the DOHC "Ultra V8," a replacement for the aging Northstar, has been canceled. The Northstar will go out of production permanently in 2010.