Andrew Sarangan wrote:

It was my impression that the pilot simply forgot to switch tanks, and
flew one tank dry while he had 20 gallons in the other tank. However,
what is the fuel burn rate in a Seneca II? Is 20 gallons worth 45mins?

With two 180 hp engines, 20 gallons should be good for at least 45 minutes.

George Patterson
Great discoveries are not announced with "Eureka!". What's usually said is
"Hummmmm... That's interesting...."