To OP
modding for performance and modding for fuel efficiency share a lot of the same parts...only for different purposes
1) lowering ride height (reduce frontal area)
2) weight savings - lightweight parts
3) aerodynamics (f1 style mirrors decrease frontal area....smooth underbelly helps reduce air resistance....front air dams direct air away from under the car...etc)
However, most important change you can make is DRIVING STYLE...any mods you do to the car will help fuel efficiency incrementally on top of driving style.
After a while, it becomes a game. Before, you would mod for an extra 5 hp. Now you mod you mod for an extra 2mpg
Have fun!
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