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  2. Replacing a clogged air filter can improve gas mileage by as much as 10 percent, saving about 15 cents a gallon. Worn out tune-up parts such as the 4, 6, or 8 spark plugs in your vehicle which fire as many as 3 millions times every 1000 miles, resulting in a lot of heat and electrical and checmical erosion. A dirty spark plug causing misfiring, which will wreak havoc with your fuel ecomomy. One day it can even make you "involuntarlily" get a ride to the shop on the back of a tow truck. I can't tell you how many expensive fuel pumps we have replaced due to a restricted $45.00 fuel filter that should been changed with a "scheduled service"
Condition
Effect
M.P.G. Penalty
Under Inflated Tires
Increase rolling resistance
2.0 m.p.g.
Dirty Air Filter
 
Causes excessive rich fuel/air mixture
2.0 m.p.g.
Worn Spark Plugs
Causes inefficient combustion, wasted fuel
3.0 m.p.g.
Dirty or substandard engine oil
Increases engine friction
.4 m.p.g.
Loose/damaged gas cap
Allows fuel to evaporate
2.0 m.p.g.
Potential loss in fuel economy if all of the above were negelected
11.4 m.p.g.