Compression Ratio per Camshaft Size

Looking at the cam manufacturers, CR suggestions are all over the place for the same duration cams. For example, 230-240 @.050 range cams I see anything from Comp suggesting 9:1 to Heughs suggesting 10:5 or even 11.5:1.

What are people's real experience with CR and cam sizing if you are trying to stay on pump gas? Any calculations that work well?