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Originally Posted by RobertSmalls
SI = spark ignition, CI = compression ignition (diesel).
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Then the cost of diesels is exagerated.
We don't pay US $ 5900 (4650 EUR) more for a comparable diesel engine.
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Replacing a sedan with a smaller hatchback, or an SUV with a smaller wagon or minivan, is an item with NEGATIVE cost and positive return. The above mods are mostly cumulative with vehicle downsizing and driving style.
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The cost for mass reduction, obviously only applies when trying to produce an equally large and powerful car with 5 to 20% less weight.
When building a smaller car, its weight will be less by default.