You can but you will have some speedometer error and will use more fuel. The vehicle will also ride lower. There is a tire comparison chart on DiscountTires.com. You choose the original tire size and then enter your desired change of size. The chart will show your speedometer error at several speeds.
You can also look up tires on other online sites. The number of revolutions per mile is one measure and it is based on the overall circumference of each tire. If your original tire turned 630 times in a mile and your new tire turns 645 times a mile, every part that turns will be wearing out more for each mile and you will use more fuel with each mile driven. You will be recording more miles traveled on your odometer than you have actually driven.
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