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What could cause my mpg to be 12/28

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Old 02-07-2011 | 10:44 AM
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dudegetalife
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Default What could cause my mpg to be 12/28

Currently averaging about 12-14 mpg in all city driving or i can do 28 mpg cruising at 65 all day long.

Before i did my exhaust i had a cat out now running straight pipe with a x1.

Pulling code p1273 now and it says its a sensor is that what i should check after i checked all the hoses and looked for an exhaust leak?
Old 02-07-2011 | 01:43 PM
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That is the air/fuel ratio sensor 1.
Old 02-07-2011 | 07:37 PM
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Originally Posted by KornerCarver
That is the air/fuel ratio sensor 1.
drivers side oxygen sensor upstream?
Old 02-09-2011 | 09:02 AM
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is that an o2 sensor?
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