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The sixth episode of the Johncast! Show Notes:

 

Credit to Kevin MacLeod for his awesome music from Incompetech, including Overworld, which I used in this episode.

"Upbeat Forever","Happy Happy Game Show"
Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
http://creativecommons.org/licenses/by/3.0/

Thanks to audioblocks.com and orangefreesounds.com, for the awesome sound effects and music.

Here is the riddle's answer: No, because gasoline was used, making the truck lighter!