I'm not going to run an idle test, because I don't have the equipment, but suffice it to say that a diesel "smokes" a gasoline engine in low consumption at idle. LOL

2008 Mercedes-Benz B 200
2005 smart fortwo cdi pulse cabriolet
1966 Peugeot 404 Coupé Injection
1989 Peugeot 405 DL