Can I use both LATCH connectors and vehicle seat belts at the same time?
No, you must not install the child restraint with LATCH and the vehicle's seat belts at the same time. LATCH should be used in place of vehicle belts, not in addition to them. Using both together can cause slack in a sudden stop or crash.
From the official Evenflo Maestro Sport Car Seat manual, page 12
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