Quote:
Originally Posted by BMW5and7
It's okay to go with slightly lower pressure values. Manufacturers typically go with higher values to gain better numbers for the efficiency or MPG. They just max out what's doable without compromising the ride too much.
3-5 PSI lower than recommended will barely change your MPG or kWh/mi usage by 1-2% but the driving comfort will be much much better.
Note that 3-5 PSI change at those pressures is almost 10% change from baseline, so yes, you should be able to feel a noticeable difference.
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I am not worried about the efficiency. More so uneven tire wear. These are heavy cars and they already go through tires very quickly. But none of that matter because the car has one of the best ride characteristics at the recommended tire pressures. Large or Small imperfections are absorbed smoothy by the suspension.