[me and my metro]

There are lots of little things that add up. Temperature trickers, get it started then tell it that it is warm and in warm air. Instantly leans out. Never use cruise control! Reprogram the transmission to shift and lockup early. Hold in the highest gear while locked up. You might even put a “short” cam in it to loose some horsepower. 40 years ago they sold economy cams that had smaller profiles than stock cams. Kind of like pulling the 350 and putting in a 305.