True, but a 2-4% improvement in FE is HUGE. Find two or three of those that your competitors miss, and you've got a car that people will think of as more efficient than the rest.
Note also that a typical car burns 7000 gal during its lifetime. Each 1% improvement is 70 gal, or $150-300 worth of fuel.
I figure a dual camera replacement mirror system might cost $200 over the life of the car, while saving $1200 in gas and another $1200 worth of gas-fueled wars, resource depletion, and climate change.
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