Saving for a car one shift at a time feels like nothing until the day it feels like keys.

Accumulation is invisible per unit and obvious only at the end. Each shift moves the number by an amount so small it reads as pointless against the gap, which is why most people stop measuring and then stop saving. Nothing about the arithmetic is discouraging; the reporting is.

Make it automatic so you are not deciding every week, and track what you have rather than what is missing. The total going up is motivating. The gap is not, and it is the same number viewed from the depressing side.