(I also regretted running too much compression in a couple of street engines because it cost more in higher octane fuel than the extra power was worth.)
How much is to much that you regretted?
( I have built and run 10:1 engines on 87 octane with iron heads and very mild cams on several different makes and sizes, so I know how to do it - but not everyone does. I started doing this over twenty years ago. I've always been after power with good fuel economy, and overall engine efficiency is the path I've chosen to achieve both goals.)
If you have built good runing engines 10:1 on 87 octane why did you stop?
