YKYAEM when ...
You have to deflate your tyres to make sure the car passes its annual inspection.
(You don't want it to fail the suspension test due to 178,000 km / 110,000 mile shocks not responding well to the vibration test.)
You think the car feels like a lead slug and coasts like a Shuttle's drag 'chute with the tyres at the manufacturer-specified pressure.
The fuel station's compressor you use to re-inflate the tyres kicks in 4 times - once for each tyre