MPG out of a 2001 6.0l gas [Expired Topic]

what kind of milage can i see with this 6.0L motor so far i drove 150 miles an only used 1/4 tank of gas (tank is 38gal) if this keeps up that would be 600miles to the tank comes out to 15an change MPG thats good in my book i just did a tune up also plugs ,wirers fuel filter an amsoil 5w30 oil an filter i only drained trans an added new ATF amsoil temp on trans on the way home never got over 150 deg thats 30deg cooler then what it was running @ sorry to ramble just excited thanks johnny