2012 Nissan Leaf uses 10 miles of battery the first 2 miles when fully charged. Is this normal?

Those trip computers are only an estimate. Electrics hardly ever go as far as the manufacturers claim.

Depends a lot on temp and acceleration. The estimate is based on optimal or typical driving conditions. I've noticed a similar drop on many leafs (leaves?) I've driven . I experimented and found that less acceleration during weather in the 70's (deg f) resulted in less dropping. This is both newer and not new.

70 degrees is about the optimal operating temperature. Higher and lower temps mean less range.