Well I do only have like 21,000 km's on my alero so I don't think I will have any O2 sensor problems.
as for how i get this kind of mileage, All I have is a drop in K&N and I took of that snorkle thinger.
And as for the question earlier if getting close to an oil change drops my mileage. For me it definately does, and I notice a bit of a loss in power. Rite now I'm almost due for an oil change and my mileage is getting kinda poopy.
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