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If I draft behind an 18-wheeler on the freeway to improve my MPG, does Conservation of Energy mean I'm actually making him less efficient (lower MPG)? Why or why not?

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If I draft behind an 18-wheeler on the freeway to improve my MPG, does Conservation of Energy mean I'm actually making him less efficient (lower MPG)? Why or why not?	1446
Why don't solar panel and battery tech advance at a pace more like processors (CPU)?	1