Don't feel too bad. I remember driving a rental Hyundai Accent hatchback. I filled the car with 4 people! Two tall ones in the back! hahaha...
oh well... I got on Route 1 and I don't know how strong the crosswind was, however I could feel the nose sort of wobble at around 50mph!! (It was scary!, even the passengers felt it)

The car also had no power at all! In fact I think the 300D is faster...

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2008 BMW 335i Coupe