how would one find out how much full is needed to travel the world

Dream large! Look up Max Conrad's book about his circumnavigation in a single engine Piper Comanche.
 
It can be done in 9 days with just 1200 gallons of fuel.
 
It can be done in 9 days with just 1200 gallons of fuel.

Instead of asking how much fuel it would take, how about setting a record for the least amount of energy used in a circumnavigation? That sounds like an interesting challenge for the OP.
 
Instead of asking how much fuel it would take, how about setting a record for the least amount of energy used in a circumnavigation? That sounds like an interesting challenge for the OP.

I think Steve Fossett will have that record for the foreseeable future.
 
Hmmm, here's an interesting tid bit. Apollo 11 used 947,529 gallons of fuel and oxidizer to travel 828,743 nautical miles, that, 1.14 gallons per NM, not bad.
 
Hmmm, here's an interesting tid bit. Apollo 11 used 947,529 gallons of fuel and oxidizer to travel 828,743 nautical miles, that, 1.14 gallons per NM, not bad.

Ahh, the joys of zero drag. I wonder what the MPG would be for Voyager, it's only gone 11 billion miles so far.
 
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