Mileage / Speed Correction

My Alphard`s stock tyre is 205/65R16. It will give the tyre circumference dimension at 2114.0mm. My aftermarket tyre and rim is 225/45R18 with 2072.5mm circumference. Previous post, managed to achieve 689.2km per full tank with 225/45R18. The actual/correct mileage is re-calculated.



One complete cycle of stock tyre will give 2.114m distance compared to aftermarket tyre contribute 2.0725m distance.
With stock ECU, stock tyre (205/65R16) will have - 326,395.5 complete rotation.
Therefore my actual distance is calculated by 2.0725 X 326,395.5 = 676.5km.

With maintaining about 110km/h along the highway which was actually 2% faster, actual speed is re-calculated then.
110km/h X 98% = 107.8km/h only!!!

That`s why i felt 110km/h for Alphard is not right. Hahahahaha...
That mean for my Alphard, to maintain actual 110km/h, speedometer must indicate 112.2km/h. Ermmm, not much difference honestly. Opted to maintain 110km/h indicatated by speedometer.