I think another reason trucks have gone to LED's is because they overcome the problem that incandescents have with voltage (brightness) drops over long wiring loops & multiple connectors.
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I'll have to check that Insight thread. I usually keep up to date on CMPG posts, but missed that one.
A Honda Civic owner measured the electrical draw of just switching on his marker lights: 95 watts. I used that in a calculation for the "alternator optional" test with my car -
http://www.metrompg.com/posts/alternator-optional.htm .