Michaels, quit being a *****. Just because it isn't at the optimum compression doesn't mean it "defeats the purpose." Just like the Crossfire running at an 11:1 air to fuel ratio above 3,000 RPMs. That's not optimum. Optimum would be 13.2:1. Get over it. Blowers and turboes still work and still produce more horsepower. If not, how does an 11:1 compression K20A engine make 550whp with a 25psi turbo?
From your own article:
According to Blower Drive Service, a final compression ratio above 12.4:1 is not recommended for use with 91 octane pump gas. This is a good general rule of thumb but certainly not a definite.
The article begins by stating there are tons of things that affect the efficiency of chargers, including cam profiles, lift duration, engine cylinder size, the adiabatic effect that each charger has which is different from design to design, the shape of the cylinder head ... you cannot just blanketly say what you're saying. And besides, the final compression ratio is still lower than 12.4:1 in every instance I've mentioned, especially after adjusting for temperature, altitude, and the fact that MOST gas stations have 93 octane gas, not 91. And even forget that, who said I was talking about daily drivers?