Try some lightweight pulleys, less drag better mpg, lightweight is the way to go.
Flywheel and clutch
All will help with mpg
U can get a tune, but not sure how much that will help. Usually oem tunes are best for mpg as is
I'd go for any weight u can lose, plus stuff to make it breathe better I.e intake,exhaust.
Plus keep up on maintenance oil and spark plugs, keep up on that and should b cruising fine