Why does my 2006 Pontiac G6 smells like gas, but no visible leaks?

What is your question?

Why does our 2006 Pontiac G6 smell like gas? We returned from a 4 hour drive, one back road was very bumpy. When we parked it, we realized that the car was extremely low on oil, and it smelled like gas towards the back end, but there are no visible leaks. Prior to the trip it was fine. We've taken it to jiffy lube for a oil change, and they didnt see any leaks. But why does it smell like gas?

How long has your 2006 Pontiac G6 had this problem?

2 weeks