German C3 Fuel, Uber Octane or Synthetic Crap?

There is a lot to cover here, the first 20 mins just go over the basics of calculating equivalent compression ratios in supercharged engines, I start with automotive examples because they are easier to understand. At about the 20 min mark we get into airplanes.

How good were the German B4 and C3 aviation fuels? We have allied reports on them, but they don't answer all the questions. Were the Luftwaffe aircraft really held back by low fuel quality, or was it something else like metallurgy?

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