LadyGeek wrote: ↑
Fri Aug 26, 2016 1:56 pm
sunny_socal wrote:...I wouldn't worry about it, obviously they just stuck the wrong (boilerplate) form in your car. As for the PSI - be thankful they're actually a little high! (Indeed to be sure you should learn to check them yourself, just get a $5 gauge next time to stop for gas.) I run all my tires @ 40 PSI if the max sidewall is 44, 45 PSI if the max sidewall is 50, 75 PSI if the max sidewall is 80. The door jamb pressures are only applicable for the tires that came with the car and for those wanting a plush ride. It has more to do with liability than anything else - the manufacturer doesn't want another Firestone fiasco on their hands.
No, the pressure is determined by the engineers - not lawyers. This is not good advice. See: What Air Pressure Should I Use in My Tires?
or google "correct tire pressure"
I'm with sunny_socal on this one. I aim about 2-4 above the door jamb figure (the number car engineers recommend) which is usually far below the max tire pressure (the number tire engineers have determined). There are all sorts of tradeoffs, but a few psi is minor IMO, and I like to err on the side of a firmer ride starting and wider margin before it gets too low. Also, with the low pressure tire pressure sensors, I seldom bother to check the tires anymore.
Costs $200 to have them replaced, so might as well take advantage of the new tech (annoying expense like keys/fobs and other advanced features that's big profit for the parts and service departments).
Anyway, this time of year, I might need to top off the tires once and again in winter, but the heat expansion often balances the slow leakage so I can go 6 months without bothering in the spring/summer (I really don't, but it's good to know you can, and I don't stress over it). YMMV
And if you have the newer monitoring systems, they give you specific pressure readouts for each individual tires. There's even one that honks the horn when you've reach the correct pressure.
Between good tires and new tech, the OCD tire checks have gone the way of the 3000 mile oil change for me. I still eyeball the tires and spot check as needed, but I'm not checking them regularly with every gas fillup. I remember the days when oil needed to be checked and/or added whenever gas was added; now it's been years since I've had to add oil between changes. I'm reminded, as I was reading about microplastic plastic polution in the ocean and the amount of tire and brake dust found, I thought about hybrid/electric cars having "lifetime" brake pads from little use. So aside from worrying less about checking for brake pad wear and replacement, it's another small benefit to the planet over conventional cars. Great when less is more.