On May 3, 2013 Patti wrote:

"I've recently learned (from here) that I should never let the gas go below half full, so I'll have to see if I actually DO get better mileage if I keep the tank above half full."

I only use that rationale/behavior in winter when temps are quite low and condensation is likely to form in the tank due to temperature disparities
between the ambient and fuel in the tank. Especially when I'm going to let the van sit, unused for days/weeks at a time.

bob