How does incorrect tyre pressure undermine Goal 1.3 fuel optimisation?

1. It has no fuel effect; pressure is only a puncture issue
2. Over-inflation is required by Goal 1.3 to reduce consumption at any cost
3. Tyre pressure is inspected only during periodic 35-hour training
4. Under-inflation increases rolling resistance, so more fuel is needed for the same speed, and it also harms stability and wear