I drive the RCF once in a while in ECO mode mainly when there is a long stretch of road and just cruising. I average around 14 km/100 liter, which translates to about 17 mpg with 90% in sport+ and manual. 10% of the time in ECO mode. Probably, if I went 50/50 on ECO and sport+/manual, I can get it up to 19 mpg.