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My Mazda3 with variable valve timing and other goodies has a compression ratio of 13:1 and runs on regular gas, and in Europe the same engine is rated at 14:1, which is allowable there due to the higher octane of European RUG.
So, with proper engine valve and timing and etc. controls, modern cars are able to enjoy high compression efficiency and power.
I've found modern cars to be much more efficient than the ones I drove in the 50s, by a factor of two or three to one.
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