Does anyone know what the spark plug torque specification is for the Acura TLX 2015 base model 2.4L?

I've looked at the manual and it provides the OEM PN, but no torque specification:



I looked at the NGK website for the part specification, and it states it is rated differently depending on the material:

"Cast Iron: 10.8-18 lb. ft. Aluminum: 10.8-14.5 lb. ft."

I've been trying to reach Acura's service desk, but I haven't gotten anyone to pick up the phone.

 

I believe 16lb/ft. or 22 Nm.
I just finger tight then between 1/8 to 1/4 turn to tighten.