I guess the 6.5 Kw Predator is broken in. It ran non stop but for re-fueling. I'm as happy with as it I expected to be. It started easily on gas that was 2 yrs old. Stabilized but even so. 30 gallons of E 10, 72hrs run time. Only gave up using the oven and the dryer. Whilst wife got 3rd shot at Walgreens, I walked to Auto Zone and bought a couple qts of STP 10w30 dino. That's what Instructions said to use. Far as I can tell, little to no oil was was consumed, It was clear on the yellow plastic dip stick. Felt good between my fingers. I want to drain the oil into a clear container to look for flashing.