I'm actually quite excited about the fuel economy. If they are saying 25% improvement over the E92, I'd say that's more like 35% in reality which should bring it to 18-19mpg city/28-29 mpg highway (comparing against the real world numbers of the current model, I usually get 15-16 mpg city/22-23 mpg highway) which is a massive improvement. If you drive 10,000 miles a year, that's about $120-140/month of savings, which is significant. It's almost as if for a lease, the fuel savings can offset the cost of most of the options/packages.
I cannot believe driving an M3 for more than 300 miles with a tank of gas is a reality now