I'm leaving the thermocouple connected to the fuel pump. Maybe there will be a really hot day sometime this summer for further testing. I will never run the tank near empty... because it's only an educated guess as to how much fuel is left. No fuel flowing through the pump will certainly damage it.
I get 25-29 mpg. When my set odometer reaches 200 miles, I fill up the tank. It usually takes about 7 gallons, leaving a 5 gallon reserve.