Cargo Volume?
Fueleconomy.gov lists the Mirage cargo volume at 17 cubic feet, which is the same as the new Honda Fit. The Mitsubishi USA site also lists 17 cubic feet.
While I haven't seen the new Fit, and the old one was 21 cubic feet, I cannot imagine they are the same size. With the seats in their upright position, the Mirage hatch is not particularly large, and some have called the Fit a small station wagon.
Could they be measuring differently?
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View my fuel log 2014 Mirage SE 1.2 manual: 45.0 mpg (US) ... 19.1 km/L ... 5.2 L/100 km ... 54.1 mpg (Imp)