Not throw a wrench in this “measure with a micrometer, split it with an axe” drill but... My ‘13 LX under reported mileage by a fraction, perhaps .05% on stock tires. On 33.0” tires it under reports miles by 5.2-5.3%. Considering what I discovered if you want to be accurate with MPG you need to GPS 10 miles or more and figure in ODO error.
Oddly the speedo is almost dead-on with 33s.
Agreed, I have about a 1mph difference between the GPS speed and truck speedo at 70mph with the 33's.
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