@ aviatorjus
PNR Is directly related to Endurance i.e (FOB-RESERVE)/FUEL FLOW.
IF FOB is increased PNR will increase.
IF Reserve required decreases PNR increases.
IF FUEL FLOW reduces PNR increases.
I guess you are trying to say that any H/W or T/W will reduce the dist to PNR which is correct.
Since an aircraft suffers the h/w for a longer time ..
but enjoy the tail wind for a shorter time..