"As part of the European Union's commitment to improving road safety, Low Rolling Resistance Tyres (LRRT) are to become obligatory from 2012. The fuel saving potential of using such rubber is 3%, the lower level of fuel consumption resulting from the reduction in the resistance to motion when a tyre rolls." Taken from tyre safe.
Lets see what happens to grip levels with the new breed of ultra hard tyres. It's great to know you'll be saving 3% of your fuel as you're sliding into a ditch...