no extra oil has really ever been needed for it, only needed it changed once so far too (every 3k) and would there be a thread on "how to" for checking for the gas leak and how to repair it?

 

If its an external leak, it should be obvious. Fuel is at a bout 50PSI in the lines... if it started leaking, you would be able to SEE the spray.

Just start the truck, and then inspect the fuel line from the tank, to the engine. If you don't see anything, the line is fine.