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Science Bowl Question

📅 NSB Double Elimination 2012🎓 HS🔄 Round 2#️⃣ Q6 TOSS UP📝 Multiple Choice

Which of the following provides the highest average efficiency increase in vehicle engines?

W) Variable valve timing and lift
X) Cylinder deactivation
Y) Integrated starter/generator systems
Z) Direct fuel injection with turbocharging or supercharging
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