Home Oil Change and a bunch of other random questions

[Chamberpains]

Probably a dumb question but you say you use 1 gallon of oil in 3000 miles. Does it happen to use 2 gallons in 6000 miles or does it kind of slow down and level off? Some engines just use a bit of oil and find their own full level. Have you ever let it go clear down to the add line and a hair below to see what the engine is actually consuming in 10,000 miles?