Congrats on the deal on your new GT, Premeir620!
I'm with the others - don't fret about your MPG just yet. It's going to be a little lower than your 2015 for sure, but it's too soon to say how much lower.
Check your tire pressure & alignment!
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View my fuel log 2014 Mirage ES 1.2 manual: 63.2 mpg (US) ... 26.9 km/L ... 3.7 L/100 km ... 75.9 mpg (Imp)