|
Although going higher may not be the best for fuel economy with all else being equal, by leaning the burn out you can open the throttle plate more and run at a higher load, which helps too. The Insight goes as high as 25:1 or 26:1 sometimes, presumably to keep the throttle plate open.
You would probably be better off running only slightly lean and regearing to get load up, but lean burn is a more versatile and easier way of keeping load high.
|