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MPG drop

9877 Views 34 Replies 17 Participants Last post by  MPGeez, 
M
All of a sudden my MPG has dropped by 10mpg at cruise. I used to get 60 at 50mph. Now it's 50 at 50. Only major change was a new set of Walmart Goodyear assurance tires in stock size.
Is that the probable cause? We're the Oem Tires that much better?! Or is there a checklist to go through to find an issue? I'm at 55k miles. Mpg got worse at 45k along with the tire swap.
Any ideas?
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All of this talk about tires...

I went from stock setup getting 45ish mpg @ 80mph to 36mpg @ 80mph with 245/35/20s on Nankangs.

Tires may be partly to blame but not all of it.
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