Sure, high-performance engines burn fuel. But they wouldn’t be able to do it for very long if it wasn't for oil of varying viscosities that lubricates crankshafts, cams, bearings, rods, pistons, rings ...
The second car that I ever owned was a 2002 Chevy Silverado 2500 with a 6.6L Duramax diesel engine under the hood. It wasn't my first choice, but it was a hand-me-down from my father after my 1993 ...