2006 Toyota Yaris Fuel consumption

2006 TOYOTA YARIS
100,000 MILES
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KHURRAMNCP
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The fuel consumption of my car was 17Km/litre on high way but recently it has been reduced to 13Km/litre. What are the possible reasons? Spark Plugs make DENSO were replaced at 60,000 Km. What is the limit in Km of DENSO plugs?
Jul 16, 2013 at 9:02 AM
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KHLOW2008
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It depends on what plugs were used. If it is normal lugs, it is way past its replacement schedule.
There are many other possibilities and it is best to start with a tune-up.
Jul 16, 2013 at 9:50 AM