I have had my new tyres on for a week now, (Hankook kinergy eco K425 205/55/16 at 38-36PSI) the tyres replace Bridgestone Turanza ER300's 195/55/16 still with 3-4mm tread left, my MPG has definitely not taken a hit in spite of larger size tyres, and tyres not run in yet, but the most noticeable thing is how quiet the car now is even on very rough tarmac. It is like some one came and fully sound proofed the car, turn in is also much sharper. To early to give exact MPG figures on only one tank of fuel but it is in the region of 62-63MPG, and will update when tyres are run in and exact figures can be established. The tyres have no ware rating as yet but the side wall information gives the pressure as safe working 51PSI, max 55PSI.
Please keep us updated as they break in. If those tires are the equivalent of the Enfren Eco then the information will be useful for us on the other continent.
UK gallons. The tyres became available here in March 2011 and are made in 14/15/16 inch sizes, manufactured in Hungary.