Foot decides everything. Also where you're travelling. My old 2.2 manual Accord, heavy footed daily drive to work full tank ~450KM, normal footed driving ~500KM, long distance drive ~600KM.

Tire pressure i have tried a lot. But better don't pump too much as you'll sacrifice comfort and grip. Quite comfortable with 230/220kPA now on 17" wheels.

But yeah as said before, just focus on the driving and enjoy it as most "fuel saving" tips gives very minimal result that is not really worth the effort.