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2004 B2300 fuel injected 161,000 miles automatic, I was getting 22 mpg in town and hwy driving, now I'm lucky to hit 18 mpg? I've changed plugs and wires, fuel filter, air filter air mass sensor but nothing helped the milage improve. Any ideas?
 

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2004 B2300 fuel injected 161,000 miles automatic, I was getting 22 mpg in town and hwy driving, now I'm lucky to hit 18 mpg? I've changed plugs and wires, fuel filter, air filter air mass sensor but nothing helped the milage improve. Any ideas?
Could it just be the colder weather?
Not got my Mazda 3 yet it's due for delivery this week, but my current car does about 55mpg in the summer and about 48mpg when the temperature is below about 5 degrees C (on the same daily commute)

Other things to check, are the brakes binding?
Are the Tyre pressures low?
 
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