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Dear Q & A: It’s my impression that car engines are more efficient than they were a couple of decades ago. Aren’t some six cylinders today delivering as much horsepower as V-8s did in the 1960s? So things are getting better, aren’t they, and it’s OK to be an optimist about cars?      — Charley M. Dear CM: Why not? To get a quantified idea of how much better some new production engines are, take the Volkswagen GTI for 2007. A 2.0-liter (200 centiliter) displacement four, it produces 200 horsepower. Compare that with the 1971 Chevy Malibu’s 5-liter V-8, with only 200 hp, or the 1993 Chevy Caprice, at 180 hp from a 5.73-liter V-8. VW’s feat is one horsepower per centiliter (cl). We used to celebrate Detroit Iron when it managed one hp per cubic inch, as in the 1957 Chevrolet 283 CID V-8. The improvement is all the more impressive when we realize that one cl is only 0.61 cubic inch. So why not be optimistic?...
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