I just upgraded to 16" wheels (but don't worry! They're still lighter than my previous 15" wheels) so my odometer reads off.
I hadn't checked it when I had the 15" wheels, but now for every 18.9 miles my odometer reads, I've actually driven 20 miles!
So that means I get to multiply my FE by about 1.06 which is a pleasant surprise when I go from what the scangauge has been telling me vs. what I end up putting into my fuel log.
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