This ^^^^ is where it’s at.
Nothing more, nothing less.
If anybody is worried about the return on dollar spent vs mileage gained they should sell the vehicle and roll the money over into the highest mileage BRAND NEW CAR they can find that gets the highest mileage available.
If your building to get mileage, then enjoy the hunt and science behind discovering what works and what doesn’t.
That! Is where that joy should be. Not cost worry. Because if there is worry, your in the wrong hobby.