Tire Pressure Max

[AlphaFox]

what kind of MPG increases are you seeing running at 50 or 60 psi? (up from stock)

[brickhardmeat]

There is a "thingy" in your glove box called an Owner's Manual, comes "free" with the Yaris. Try opening it up. Theres lots of words in there and "stuff"

[BailOut]

Originally Posted by AlphaFox

what kind of MPG increases are you seeing running at 50 or 60 psi? (up from stock)

That's a hard one to answer because your driving style really plays into it. If you're a regular, everyday kind of driver then you will see maybe 0.5 - 2 MPG, just because it's easier for your engine to make the car roll if it doesn't have to fight the tires so much.

If you hypermile then the benefits shoot through the roof. For example, on my commute home there's a section of the mountain road that is just very slightly downhill for almost a mile. I used to have to use fuel in this area but with the tires at 60 PSI I can turn off the engine (and then go back to Ignition II to keep PS/PB for a while) and coast that entire section without dropping speed. I can pull a similar stunt for about another mile at the bottom of the mountain after going through the clover leaf on-ramp. I can use it twice again in my subdivision for another half mile each time after accelerating to 40 in a 45 MPH zone. I can stealth coast from the main subdivision road through 4 90-degree turns and right up my driveway and into my garage.

[PetersRedYaris]

Not to bring you guys down, but, this is a really bad idea. Max pressure is called that for a reason. You do know your tires heat up with highway speeds so even putting them at 44 means they are running far higher than that with sustained speed. Setting them at 60PSI means they could go over 70 with summer heat and fast driving. Blow-out time!

[BailOut]

Originally Posted by PetersRedYaris

Not to bring you guys down, but, this is a really bad idea. Max pressure is called that for a reason. You do know your tires heat up with highway speeds so even putting them at 44 means they are running far higher than that with sustained speed. Setting them at 60PSI means they could go over 70 with summer heat and fast driving. Blow-out time!

Back in the 1970's you would have been right, Peter. However, since that time consumer tires have been steel belted which prevents this from happening. The worst that could happen on just about any modern tire is some uneven and/or early tread wear.

I commute over a mountain every day in snow or sun at 60 PSI without issue. As I mentioned earlier a fellow hypermiler who does a lot of highway driving just hit 85,000 miles on his RE92s, which is literally impossible at 32 PSI. We are just 2 out of a pool of folks that have been running at 60 PSI for quite some time now not only without issue but with several tangible benefits.