It's irritating, but I lay a great deal of the blame on the DE service center. What do those signs even mean? What's a "fuel efficient vehicle?" Compared to what?
I'd greatly prefer that they refrain from putting up weird and meaningless signs like these, because it increases the likelihood that people will see legit EV charging signs and misinterpret them as more of the same.
You're right, and I agree with you. Sorry about my "outburst". I was thinking more about people who block charging spots when the signage is clear. The fuel efficient signs are ambiguous and confusing.