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I've got 39,xxx miles on my 15' Mirage (5 spd). I do try engine braking as much as I can as well. I do feel a bit of vibration while braking as well, so I'm definitely going to be changing the rotors/pads soon. Not sure if weather has to do anything with the faded brake pads or not. I do know that this past winter, the steel wheels were stuffed with snow several times with the amount of snow we got.
View my fuel log 2015 Mirage DE 1.2 manual: 43.8 mpg (US) ... 18.6 km/L ... 5.4 L/100 km ... 52.6 mpg (Imp)