Hi Carol and welcome to the forum!
Ha! Funny.
Yes, the Mirage and most lightweight cars suffer from buffeting when passing/being passed by large trucks.
But many members have done long road trips with their Mirages. Lots of replies in this thread:
Thread: Done any long trips in your Mirage yet? Comfortable? Good fuel economy?
Another recent one:
Thread: Did my first long road trip
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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)