Vehicle Maintenance Tips Worn spark plugs or clogged fuel injectors can reduce fuel efficiency 30 percent. When tires aren't kept properly inflated, fuel efficiency could be decreased 8 percent. Car maintenance is also important for personal safety. Each year 2,600 deaths and 100,000 disabling injuries are the result of car neglect. Inspect engine belts regularly.
Worn belts can affect an engine's performance.
Check the air filter about every other oil change. The rubber seal around gas caps can deteriorate, releasing vapor that reacts with air to create ozone pollution. Check and replace when necessary, about every three years. Hydrocarbon vapors are the primary precursors of ozone, which is triggered by the summer heat. Ozone is mainly a daytime problem when temperatures are high, sunshine is strong and winds are weak.