One's own car; a privately owned automobile used for commuting, travel, etc.
毎日マイカーで片道30分かけて通勤している。
I commute 30 minutes one way by my car every day.
週末はマイカーで田舎へドライブに出かけた。
I went for a drive to the countryside by my car on the weekend.
都心は駐車場が高いので、マイカーを手放す人も増えている。
Parking is expensive downtown, so more people are giving up their cars.