Lawn services like to come every week whether it needs it or not so they can charge you...
I take care of mine and the neighbor next door... She's an older lady and her family has been in the house since the early 70's... She took it over when her dad passed away, so I help her out and mow the lawn and clear the snow off the driveway during the summer and winter... I let her give me what $$$ she can... I earn a little money and she saves some by not having to pay a lawn service....
My yard takes 3 tank fulls, hers takes 4.... The mower tank holds about 1/4 gallon....