Thread: New Plugs - Worse Gas Mileage ???
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Old 05-29-2007, 05:57 PM
mdoyle mdoyle is offline
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Default Re: New Plugs - Worse Gas Mileage ???
Ditto on Bosch bringing the "suck" when it comes to plugs. I had a similar experience in my old Tahoe with them and went back to AC Delco.

Same heat range, ect- Bosch performed poorly.
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