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Exhaust system leak is a real possibility for that code, but 11.5 mpg? Those are 1974 type numbers.
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One of my friends has a Tahoe which was having the same symptoms and he told me it turned out to be a dying upstream O2 sensor.
I do...
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4.2
I did reset it for a drive from Lewiston to Moscow and back and it topped out at 11.5
I will say it does feel like I'm getting gas...
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I recently became the owner of a 2005 GMC Envoy XL. It runs and drives just fine however it does have a P0420 that comes and goes, and...
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