Regarding large snow tires and odometer effects (300m)

So the snow tires on the front of my 300m are these:

Cooper Discoverer M+S 215/70 R 16

They're not new (so maybe missing 1/16" or 3/32" worth of tread).

Only about 1/4" clearance between the tire and shock-tower guard.

Recent highway trip (about 100 miles) and 6 data points correlating
highway mile-markers and odometer readings show that for every mile (or
km) being travelled, that the odometer is turning over 0.9655 miles (or
km). Correlation coef. for the data is .9999. Road conditions were
dry, no snow. Speed was between 65 and 70 mph constant as set by cruise
control (110 km/hr).

The circumference of these tires are therefore about 3.57% larger than
the stock or reference tire, which is 225/55 R 17.

Speedometer correlation with GPS indicates that the speedo gives a
perfectly correct speed reading with these tires (not an
under-estimation as you would expect).