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MPG drop

9881 Views 34 Replies 17 Participants Last post by  MPGeez
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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Trying to figure mine out also. I have had a steady decline for a long time. Before and after tire change. Wierd mine didnt have the special tires when I bought it new. Currently avg of 30 mpg instead of 40 mpg us. I just cleaned map and it really needed it but doubt that was the total difference also. Just took off underside plastic havent put back on yet wonder what that will do to mpg?
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