View my fuel log 2018 Mirage ES 1.2 manual: 43.5 mpg (US) ... 18.5 km/L ... 5.4 L/100 km ... 52.2 mpg (Imp)
My Yaris handles and performs much better than my Mirage. But I'd bet that with some additional suspension work (e.g. coilovers), the Mirage would be close to the handling characteristics. Engine wise, however, the Yaris is quite a bit zippier.