Actually, the remove request came before your comment, redpoint5.
I appear to have poked the lion.
While I appreciate the sentiment for coming up with a dedicated symbol that indicates "Hypermiler On-Board"
, there's approximately a zero percent chance it would ever become general knowledge.
Why re-invent the wheel?
The slow-moving vehicle sign on the other hand is already taught in driver's ed and is usually one of the questions on the driver's written test.