Not being realistic about what you need Before you hit the showroom floor, take a hard look at the kind of driving you do. Don't assume you need a brand-new car, and consider keeping a driving journal for a week, or even a month, to chart exactly when, where and how far you drive each day. Then buy a vehicle according to those needs--not aspirational needs, like thinking "maybe someday we'll need to tow a boat, so I need a truck with three-ton towing capacity."