Welcome to the forum, skystarsystem.
Have you gotten a chance to try out a Mirage yet?
In a way the cars are already designed as "soft roaders" since they were primarily engineered for the relatively poor roads of developing nations. The 2014 cars' suspension was completely unchanged when the cars were exported to North America/Europe (thus the many complaints about the "too soft" suspension).
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View my fuel log 2014 Mirage ES 1.2 manual: 62.4 mpg (US) ... 26.5 km/L ... 3.8 L/100 km ... 74.9 mpg (Imp)