system
Given the following post, respond as if you're commenting on Reddit:
human
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?
gpt
You're taking advantage of work already done by the semi. The semi did a lot of work to push the air out of the way. If you weren't there, this work would have gone to waste - but if since you **are** there, you get to take advantage of it.