Unusable fuel is not included in the aircraft basic weights..only oil is.

Chuck.

Srely, relying on unusable fuel is not only pointless (you can't use it) but also if one's fuel planning is THAT close.....?

Chuck,

I'm afraid your wrong. To quote from safety sense leaflet 9A:

Standard Empty Weight
The weight of the aircraft and all its basic equipment including unusable fuel, full oil and full operating fluids

Basic Empty Weight
Standard empty weight plus installed optional equipment

I can also say I have always seen unusable fuel included in the BEW data in the POH.;)

D&O

Obviously it shouldn't make a difference in practice but in extreme circumstances, whether of your own making or someone else's, you could find yourself in the garden of a house on the approach instead of landing on the airfield with 4 gallons to spare if someone has wrongly included 5 gallons of unusable fuel in the Tech Log.