I need some assistance with a math equation. Here is the deal: I put some slightly taller tires on my truck. Because they are taller, I am actually driving more miles than the odometer shows because the tire revolution per mile is different. I cannot for the life of me wrap my head around finding the percentage it is off. Original stock size tires: 195-70-14 New tires: 205-70-16 According to an online tire size comparison: https://tiresize.com/comparison/ Stock tires are 815 revolutions per mile New tires are 739 revolutions per mile How do I find the percentage difference? Divide the 815 by 739? That comes to something like 1.102 ish, does that mean for every mile that shows on the odometer, that I am actually driving 1.102 miles? Is that how it works? The website also states that the speedometer would be off as well, which I knew about. It shows that when the speedometer is showing 60 mph, that I am actually moving at 66.3 miles. I think that would mean that for every 60 miles I put on the odometer, that I am actually traveling 66.3 miles. Am I right on this? 66.3 divided by 60 comes to 1.105, which is pretty close to the figure above in tire revolutions. I'm trying to keep track of actual mileage for oil changes and for gas mileage. Even though I use math a lot during the course of the day, I am drawing a blank on this. Pretty sure I am right, but looking for second opinions.