So I went through and measured my tires for the speedo calibration and came up with several different measurements.

First I marked the two rear tires and measured the distance after each revolution. Each tire had a different number.

Driver Rear: 98 15/16, 98 7/8, 98 3/4
Passenger Rear: 98 5/8, 98 5/8, 98 3/4


Then I marked the rear two tires and made three revolutions and measured the tires and each tire was different.

Driver Rear: 295 5/16
Passenger Rear: 296 11/16


So what numbers should I use to complete the process?