modifying the air and fuel systems and even some internal engine work will do it. You'd be surprised how some car makers can take an engine in it's first year of production and years later have it get more MPG's than people ever though it could get.I think that my 2011 G37x is 18/25 or something like that. Does anyone know what specific measures Infiniti took to raise fuel economy?
I'd be interested to know how they improved the mileage on the drivetrain if its apparently exactly the same.
Here are the "cliffs notes":brain literally just exploded!!!!!!! Hahaha