Thanks - great and refreshing to see some actual measurements! Facts almost always help displace urban legends...
It is interesting that the temp differential is significantly more with less fuel in the tank. Stands to reason certainly, but does indicate that fuel heating is real, although as you observe, probably not significant as far as a failure factor.
I wonder if the same differential would be found on a very hot, (say 95 degree) day and a long 3-4 hour run with a tank tending toward empty.
