Should the tether strap be used when the car seat is in the forward-facing position?
Yes, you should always use the tether strap when the car seat is in the forward-facing position to reduce injury risk. Failure to follow this guideline increases the risk of serious injury or death in a sudden stop or crash. (Page 2)
From the official Graco 4Ever DLX 4-in-1 Car Seat manual, page 2
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