why compromise comfort handling and safety ?
Handling is a lot better with the tires a bit more inflated, for the same reason it spends less energy, tyres deform less... You do loose a bit of traction because the area of contact with the floor is decreased. You also loose traction if you underinflate the tyres.
Unless you drive very fast or over sand, you usually have a lot of spare traction.
NEVER run anything other than the recommended pressures
100% agree, but learn to read the recommended pressure. In Europe, according to the authority which establishes the rules, ETRTO, the number on the car door and manual, is to be interpreted as a minimum. The pressure should never be lower in any moment. Plus, the pressure should be increased if you are going to drive in harsh conditions (high speed, heavy charge, towing, long trip time).
So, if you adhere 100% to the recommendations in Europe (using the values for the EV):
This is the document the European Tyre and Rim Technical Organisation
- Keep tyre pressure above 2.5 bar (36 psi).
- Increase pressure by 0.2-0.5 bar (3 to 7 psi) if driving at sustained high speed, heavier charge... resulting in 2.5 to 3.0 bar (36 to 43 psi).
- Respect tyre cold pressure maximum inscribed on the tyre, 3.5 bar (50 psi, pressure reading when cold).
publishes for consumers for free, you want to read page 22. This is a new edition, September/2017, may have some differences from what I said.
Now, the risks: over-inflation increases the risk of impact damage, particularly puncture (on the other hand, it protects the rims better). Under-inflation is dangerous for driving, and increases the risk of tyre break-up (tyre deforms more).
I drive a lot on motorway, so I have my tyres usually inflated 0.3 bar over the number on the door (2.8 bar = 40 psi). I think this is in perfect accordance with ETRTO recommendations. I thank the extra range. I have no problems with that driving in Lisbon on sett paved roads and tram lines.
PS: About heat: don't worry. When you see a letter V tyre, in Europe, it automatically means that it is rated for a maximum cold pressure of 3.5 bar (50 psi). A V tyre is rated for driving at 240km/h. Testing is performed at that speed and at its maximum pressure. You're not heating it anywhere near that.