FIFO and inflationary environment

When there is quite some inflation in subsidiary but no offical hyperinflationary environment, ccy of subsidiary is depreciating.

What is the impact on gross profit margins ?

Looking for difference between FIFO-LIFO and current method-temporal method.

FIFO should be higher GP margin right because of inflation ?
But current method - temporal method, does this make any difference? Both use average rate for sales and cogs but for inventory how does this play out in terms of the ccy.