Switching Tanks on the Ground?

[Skyatty]

I have a relatively long taxi from my hangar to the runway at KSLC.  I start up and have the engine running while I get the Class B clearance, check the intstruments and controls and finalize the cockpit organization.  I taxi to a numbered spot on the ramp, which is where I contact ground for a taxi clearance.  As I approach that spot, I switch tanks before taxiing to the runup area.  That gives me about five minutes on one tank and about the same on the other before takeoff.  There are also enough turns in the taxi route to help settle anything in the tank before takeoff.  I try to replicate the timing at other airports as well.  It is another reminder to me to not hurry departures.