I remember getting excellent mpg from the i20 1.2 when first launched. But readers generally are getting about the same from the new 1.0T as they were from the older 1.2: www.honestjohn.co.uk/realmpg/hyundai/i20-2015/. Switching to super petrol such as Shell V-Power Nitro Plus will get you more because then the engine develops more torque at low rpm and you can change up earlier. But you could try changing up earlier anyway and that should get you slightly better mpg.