What is highest PSI in tires you have used?

[mazilla]

Originally Posted by daf62757

I am starting to think that pushing the 50's level isn't that stupid. With gas going up, the real issue is wear vs cost. I have been driving on 50 psi for over a year on my OEM tires and I still have a lot of tread wear left, get great gas mileage, and the handling is about the same as when I drove my Yaris off the dealer's lot.

I see this as an economic issue not a safety issue. If I can get more mileage and save money at the pump, the cost of new tires will only be more if they offset the fuel costs I don't have to buy.

And since I already have 50k miles on my OEM tires and probably will get another 20k more, I am riding on free tires and if I can save even more on gas by increased tire pressure, its not dumb. Its money smart.

The money you save over the life of your 100 dollar tires might just cover your deductible, but will it cover the potential lives lost?


Now, at 50lbs I really doubt you'll have an issue...but that's where it starts, it ends upside-down on the freeway after you've gotten complacent with Your "experiments" and normally I'd say it's your life, do with it as you please...but when it comes to driving you have to consider the lives of the people around you, that's what's really at stake here.


It's not money smart, it's selfish.

http://www.popularmechanics.com/cars/news/4199963

We’ve heard folks claim mileage gains by running their tire pressure above the manufacturer’s recommendations. In theory, that makes sense: With more inflation pressure, the tire bulges in the center of the tread and creates a smaller, skinnier contact patch with the road. This should mean less rolling resistance and increased mileage.

What’s more, we know under-inflated tires have a negative effect on fuel economy. The U.S. Department of Energy says that for every 1-psi drop in pressure, you can expect your gas mileage to lower by 0.4 percent.

If under-inflated tires drop your fuel economy, then over-inflated tires must give that mileage a boost—right?

We decided to find out. So, after saying goodbye to half our test car fleet, we took our long-term Honda Fit on an 800-mile road trip from Los Angeles to Phoenix and back again—setting our cruise control to 70 mph except for dips down to 65 mph in central Phoenix and downtown L.A.

The door placard on the Honda recommends 32 psi in all four tires. The sidewall says the maximum pressure for the tires is 50 psi. So for the trip to Arizona, we inflated the tires to 45 psi. We figured 5 psi under that maximum inflation pressure would reduce drag enough to boost our mileage by some measurable amount. Before reaching Phoenix’s West Valley, we were able to travel 394.1 miles, then filled up in Glendale with 9.34 gallons and recorded 42.19 mpg. That’s the best mileage we’ve recorded so far in this car.

Two days later, we dropped the pressure back down to the recommended 32 psi and pointed the Fit’s nose home toward L.A. This time, over the exact same route, at the same speeds, the Fit went 411.3 miles. At the Chevron station in Santa Monica, our Fit drank 9.76 gallons, translating into 42.14 mpg—nearly the exact same mileage.

To invoke the MythBusters, we’d now consider the myth of increased fuel economy from over-inflated tires officially busted. So why didn’t the harder tires with less drag result in better mileage? Well, you’ve got to figure that, at 70 mph or so, the aerodynamic drag of the car’s body is probably outweighing the small improvements the tires gave us.

And we wouldn’t recommend anyone try this one at home either. The vehicle’s handling is compromised when the tires are over-inflated. At 45 psi, the ride was brittle. In fact, the tires were so stiff they nearly vibrated our garage-door opener right off the sun visor.