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Now.... Efficiancy: the ratio of the work done or energy developed by a machine, engine, etc., to the energy supplied to it, usually expressed as a percentage. When where talking about the "efficiancy" of an engine, the ONLY way it can be measured is hp/liter. A poorly engineered engine needs loads of displacement(leads to bigger, heavier engine) a well engineered engine needs little displacement to gain larger output. If the LS engine was engineered on the same level as the japanese engines, the ZR1 would have 638hp from a naturaly aspirated 5.3 liter v8 instead of a blown 6.2, or maybe even a 4.6 liter blown/boosted v8. OR hell, maybe even a highly "efficient" and highly advanced 3.8 liter TT V6. Wait......... ooops nissan already thought of that.
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