It looks like the ethanol-car sense is pretty new. It seems to have support on google. Seems there's none at b.g.c. (searching "cornfed vehicle") but then it's hard to check since the other senses are orders of magnitude more common. I couldn't get any info from groups.google.com because even searching for "cornfed vehicle" the usages were still drowned out by the other senses. Language Lover 15:11, 26 December 2007 (UTC)
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Rfv-sense: (informal) having an attractive body obtained through farm work