The Toyota Camry Hybrid Repair Manual (page ME-40) gives the factory specifications for the speedometer as follows:

Reference: miles per hour (for USA)
Actual speed 20 — Acceptable range 20.0-23.0
Actual speed 40 — Acceptable range 40.0-43.5
Actual speed 60 — Acceptable range 60.0-64.0
Actual speed 80 — Acceptable range 80.0-84.5
Actual speed 100 — Acceptable range 100.0-105.0
Actual speed 120 — Acceptable range 120.0-125.5

Reference: km/h (for Canada)
Actual speed 20 — Acceptable range (17.5-21.5)
Actual speed 40 — Acceptable range 38.0-42.0
Actual speed 60 — Acceptable range 58.0-63.0
Actual speed 80 — Acceptable range 78.0-84.0
Actual speed 100 — Acceptable range 98.5-104.5
Actual speed 120 — Acceptable range 119.0-125.0
Actual speed 140 — Acceptable range 139.0-146.0
Actual speed 160 — Acceptable range 159.0-167.0
Actual speed 180 — Acceptable range 179.0-188.0
Actual speed 200 — Acceptable range 199.0-209.0
Actual speed 220 — Acceptable range 219.0-230.0

You'll note that the speedometer is not allowed to under-read, as per international legislation. The error is supposed to be less than or equal to 5% according to Toyota's specifications. Mine seems to be accurate to within 1-2%.

Stan