The X Multi Energy Z tyre shows a 15% reduction in rolling resistance, leading to fuel reductions.The new steering tyres boast improved fuel efficiency, long tread life and good durability. They have been designed for the regional and emerging super regional applications. The reduced rolling resistance is achieved with new casing technology that keeps the sidewall and bead cool. Good fuel economy and high mileage also result from Michelins dual compound tread technology, which has a top wear layer of tread over a fuel efficient and durability bottom layer. Casing life has been extended through the use of curb guards to protect the sidewalls from impacts and abrasions, groove bottom protectors to help prevent stone-drilling, and a full width elastic protector ply to protect the casing. Source: http://www.michelintruck.com/