Question. Going on a XC to KCRE and spending practically the entire day there. Takeoff around 1200z and probably coming back home around 2300z. Not going to be using much fuel since im flying a DA-40 down there and the trip is only about 50min. Should i top off down at the airport (KCRE) or would i be ok and just save some money and sump the fuel before i takeoff? Just don't want any air in the tank while it sits tie downed at airport for 6+hrs.