Random thought but... If you have a 4cyl and swapped out your wheels for the stock V6 model wheels/tires, you may have wondered if the difference in tire/wheel size affected your speedometer calibration:
4cyl stock wheels: 225/55R17
6cyl stock wheels: 225/50R18
Attached an image of a speedometer calibration tool based on tire / wheel size that shows that upgrading from the 4 to 6 cyl wheels without any speedometer recalibration would result in only a 0.43% understatement of the actual speed i.e., if your speedometer says 100mph, you're really going 100.43mph. Stated differently, after driving 100,000 miles you've really traveled 100,430 miles. Not too bad. Thought I'd share.
4cyl stock wheels: 225/55R17
6cyl stock wheels: 225/50R18
Attached an image of a speedometer calibration tool based on tire / wheel size that shows that upgrading from the 4 to 6 cyl wheels without any speedometer recalibration would result in only a 0.43% understatement of the actual speed i.e., if your speedometer says 100mph, you're really going 100.43mph. Stated differently, after driving 100,000 miles you've really traveled 100,430 miles. Not too bad. Thought I'd share.