Should I use the tether strap when the seat is installed rear-facing?
No, you must never use the tether strap when the child restraint is in the rear-facing position. The tether strap is for forward-facing use only. When installing forward-facing, however, the tether strap must always be used regardless of whether you are using LATCH or the vehicle seat belt. (Pages 7, 13)
From the official Evenflo Sureride Titan 65 Car Seat manual, page 7
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