Volkswagen's New 300 MPG Car Not Allowed In America Because It Is Too Efficient:
You won't find the 300 MPG Volkswagen XL1 in an American showroom, in fact it has even been denied a tour of America because it is too efficient for the American public to be made widely aware of, and oil profits are too high in America with the status quo in place. Ref. Source 4
Image from Wikimedia public domain.
300 MPG Volkswagen XL1 (Hover)