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MPG drop

9896 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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Did you have the emission recall done recently? I had the recall done at the beginning of the month. Prior to recall, hand calculated mileage was about 1.5-2 MPG better than DIC mileage. Today I filled up for the second time since recall work. Hand calculated mileage 5 MPG better the DIC. On the first tank I noticed a difference but chalked it up to the manual regen. Maybe there is a calibration problem when the computer is reset during recall work. just wondering
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