You should see some awesome results with a proper working MAF. I had the same after 150K on my '05 Malibu. I gained about .5L/100km back. Tracking your gas mileage like a hawk can help track down problems starting. I don't run any of my tires past 36 psi cold. Roads are too nasty up here. Gas prices have been climbing up here again and staying high at around $1.20/L regular - probably for the long weekend coming up...
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