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Ford new 1 liter ecotech engine is a great example of how to use a supercharger or turbocharger to increase overall engine efficiency. In the less than 1% scenario when you need extra power, like merging on the Interstate, you have the burst of power, instead of having an over sized engine running at lower efficiency all of the time except when you are rapidly accelerating.
Consider the size and power of the average 18 wheeler compared to the engines power and torque. Combine that with the aero drag of a big ring and the mileage they can get is many times better than any passenger car if you factor in the amount of mass they are moving and the aero drag they have to deal with.
regards
Mech
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