Expected reliability is the single most important factor in deciding on a car, according to J.D. Power. Whether you want a vehicle for off-roading, track days, or everyday commuting, you definitely don’t want one that will cost you a lot of extra money, time, or frustration in repairs. J.D. Power’s annual Vehicle Dependability Study, now in its 27th year, polls owners of 3-year-old cars to determine the number of problems they experienced during the previous 12 months. The company then ranks each maker and model by the number of problems experienced per 100 vehicles.