The majority of the top 5 most common failures and fixes in the index are related to durability vs. faulty parts, supporting industry statistics that consumers are holding onto cars longer and manufacturers are making vehicles to last longer. The data also demonstrates that durable parts, which should last longer, are failing more frequently due to lack of maintenance. As vehicles age, the index repeatedly illustrates the impact of maintenance on gas mileage, safety, the environment and costs. Ignoring small problems is fueling more expensive repairs. Additionally, as hybrids are aging and approaching 10 years on the market, the cost of repairs is still high. And, for the first time since on-board diagnostics was added to vehicles, gas cap is no longer the top fix for “check engine” problems. In fact, 4 of the top 5 fixes (replace O2 sensor, catalytic converter, spark plug and mass air flow sensor) are related to vehicle durability.