Can I use LATCH/UAS to install the seat if my child weighs more than 40 lbs?
No, you must not use the lower anchors (LATCH/UAS system) to attach this child restraint when restraining a child weighing more than 18 kg (40 lbs) with the internal harness. For children over 40 lbs using the internal harness, you must use vehicle belt installation only. (Page 16)
From the official Evenflo Everyfit Car Seat manual, page 16
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