Question: what is the most fuel efficient luxury sedan?
Answer: Lexus CT200h. ... 
Lexus ES 300h. ... 
Lincoln MKZ Hybrid. ... 
Lexus GS 450h. ... 
Acura RLX. ... 
Infiniti Q50h. ... 
Infiniti Q70h. ... 
BMW i8. Sure, the i3 may be more economical, but it's the striking 2015 BMW i8 that really blends premium looks and performance with superior efficiency.