According to the research, web retailers could increase consumer engagement by 85% with a mobile-specific website.

 
The Google experts also mentioned mobile optimization rules for webmasters that we can also apply to Ecommerce mobile websites:
  1. Keep it Simple
  2. Design for the Thumb
  3. Think Fast!
  4. Make it Action-Oriented
  5. Speed up Load Time
  6. Optimize the Experience for Local Stores
  7. Focus on an Easy Checkout
  8. Check Your Mobile Analytics Data
  9. Allow Important Elements to Stand Out
  10. Test, test, and test some more…

See : http://goo.gl/XBH4i