Cells don't live for free and fat is stored in cells. So yes storing fat burns calories, just far less than muscle. And that's just the direct expenditure. I s

Cells don't live for free and fat is stored in cells. So yes storing fat burns calories, just far less than muscle. And that's just the direct expenditure. I see a few numbers thrown out for how many calories a pound of fat burns a day, but that direct burn is only one way additional fat would lead to energy use. A heavier person while less "active" will burn more during day to day due to carrying a heavier mass. I'm sure there's plenty more ways but I'm not going to go do a deep dive.