I was recently reading my honda owners manual from 1983 and it said that if you are going to be doing continued highway driving that you should add another 5psi of air to your tires above the normal recomended presure to prevent tire falure from over heating, and I thought that it was one of those ideas from the past, then I was reading a honda owners manual from 1997 and it said the exact same thing! for continued highway driving inflate your tires by an extra or so 5psi.
the glove boxx says 35 PSI in front and rear. should i increase thator leave it stock. i do 30/70 highway/city.
also how much will the speddo be off if i overinflate?
All I can do is offer my opinion(IMHO): The sticker in the glove box is a joke! Get a decent tire pressure gauge (I like analog better...some people need the numbers! LOL), add at least 5 pounds per square inch, and check 'em once a week - in the cooler AM...before driving! A tire pump(the old fashioned barrel-type with the cross handle) is also very, very handy...especially when you are late! Keep 'em tight, and keep your front end in alignment! Do not assume the factory alignment is correct! You're in for a big surprise when you get that "first alignment" done (the sooner, the better!)... it will(!) be off! ; then,once every 20, 30K miles, check it again.
The speedo will not be off any more than it already is! Tire diameter does not change with those steel belts in there!
30 / 70 what? MPH? MPG? Besides, isn't this backwards?
If you'll notice, Toyota provides many vehicle platforms different specifications for different parts of the world. Specifically Europe. Where the starting tire pressure will be identical, but you'll see advice such as, "For extended highway driving, or driving above 90mph, run XXpsi. In the case of the Camry platform. For many years OEM was 32psi, and then recommended 38psi)