As a side issue and apologies in advance if this is teaching you granny how to suck eggs!
For those unaware: fitting bigger diameter wheels/tyres fool you speedo into showing you’ve done less km than you have actually done. And your speed will show as lower than it actually is.
So in effect it could show your mpg (or metric equivalent!) as lower than it actual - ie your economy will show as worse than it actually is.
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