Appreciate the input.
If the air is still moving, then all the ram rise has not been taken out of it, thus even at an under wing point (higher pressure), I do not believe the temperature will be the same as the TAT as measured. In fact, only at the l/e stagnation point should it be the same as the TAT figure.(all ram effect accounted for)
Therefore, shouldn't it be possible for the fuel temp to fall below the TAT figure, if you sit there long enough? (discounting fuel cooled oil coolers/IDG's etc)?