Most mechanical failures can be traced to neglected maintenance. For example, the U. S. Department of Transportation reports the leading cause of mechanical breakdown on our nation's highways is overheating, a condition that is easily avoidable. Other deficiencies that are simple to detect include low antifreeze/coolant, worn or loose drive belts and defective cooling system hoses.

Checking tire pressure and inflating a tire costs nothing, yet an average of 21 percent of cars inspected in check lanes during National Car Care Month have under inflated tires. This can lead to a blowout and a serious accident.

Fuel Saving Tips

Condition Effect MPG Penalty up to
Under inflated tires Increase rolling resistance 1-2mpg
Dirty air filter Causes excessively rich fuel/air mixture 2.0mpg
Worn spark plugs Cause inefficient combustion, wasted fuel 2.0mpg
Worn O2 sensor Unable to detect and adjust air/fuel mixture 3mpg
Dirty or substandard engine oil Increases internal engine friction 0.4mpg
Loose gas cap Allows fuel to evaporate 2.0mpg
Potential loss in fuel economy if all of the above were neglected
 		 11.4mpg
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