Air pressure, MPG, tire wear
#1
Air pressure, MPG, tire wear
So, the door jamb of my '19 300h says 35psi.
Vehicle was delivered with all four at 45psi.
I assume that:
Overinflated: Less rolling resistance, slightly higher MPG, less compliant ride, less tire life due to uneven wear.
Inflated at spec: More rolling resistance, slightly lower MPG, more compliant ride, even tire wear.
Any thoughts/recommendations?
Vehicle was delivered with all four at 45psi.
I assume that:
Overinflated: Less rolling resistance, slightly higher MPG, less compliant ride, less tire life due to uneven wear.
Inflated at spec: More rolling resistance, slightly lower MPG, more compliant ride, even tire wear.
Any thoughts/recommendations?
#4
Use the recommended 35 psi. Tire pressure will go up as the air warms. If your tires are 45 psi in the morning, they're too high. They should be 35 psi first thing in the morning and if they get higher as the day goes on it's fine.
Tires that are over/underinflated do wear out faster, affect ride quality, but also put you at a much higher risk of hydroplaning during the winter.
Tires that are over/underinflated do wear out faster, affect ride quality, but also put you at a much higher risk of hydroplaning during the winter.
#5
Hydroplaning is more likely to occur with under-inflated tires than over-inflated tires. With lower tire inflation, there is a larger surface area that the car must push through and push the water out of the way. With higher inflation, there is less tire surface area to push the water out of the way.
This is the reason tire specialists recommend narrower tires for winter (snow) driving: Less surface area means less risk of floating on top of the wet stuff.
This is the reason tire specialists recommend narrower tires for winter (snow) driving: Less surface area means less risk of floating on top of the wet stuff.
#7
I keep mine at 35 psi cold. It's important to check pressures when cold, first thing in the morning before the car has moved and the tires have warmed up. And don't forget the spare if you have one.
You'll have to top up the pressure as winter progresses because tire pressures drop with colder temperatures. I keep a small electric compressor in the trunk that runs off the rear seat 12V port.
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#8
I keep mine at 35 psi cold. It's important to check pressures when cold, first thing in the morning before the car has moved and the tires have warmed up. And don't forget the spare if you have one.
You'll have to top up the pressure as winter progresses because tire pressures drop with colder temperatures. I keep a small electric compressor in the trunk that runs off the rear seat 12V port.
#10
#11
The tread pattern is not as effective when the tire is under inflated, still causing an increased hydroplaning risk.
Tire Rack has an excellent article on it here. After I read that article I became much more vigilant about proper tire pressure, especially in the cars of my loved ones!
Tire Rack has an excellent article on it here. After I read that article I became much more vigilant about proper tire pressure, especially in the cars of my loved ones!
#12
Here is a full link: https://www.tirerack.com/tires/tiret...e.jsp?techid=3
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AnthonyMJ (01-29-19)
#13
I like mine at 33 psi. Slightly better ride is why. I don't care if they wear out sooner. I think the 35 psi factory rating is a compromise for an unloaded vs a fully loaded car. My car is always unload except for the driver. The tires warm up to 35 psi during highway driving anyway.
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