Can I use the LATCH/UAS lower anchors for a child weighing more than 40 lbs?
No — do not use the lower anchors of the LATCH/UAS system when restraining a child weighing more than 18 kg (40 lbs) with the internal harness. In that case, you must use vehicle belt installation only. (Page 16)
From the official Evenflo Everyfit Car Seat manual, page 16
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