screw more psi in the tires.

[07WYarisRS]

WTF are yo guys serious?

you actually think a few PSI is going to save you MPG that you will be able to calculate?
The foot print has not been changed until max highway speed when the tires stretch to their limits, The engine still burns the same amount of fuel, the car still weighs the same... you have done nothing but shred 50K off your tires by over inflating them on such a light car... Guess what if you save $20 in the last year with the higher air pressure it just cost you $400 for new tires

Stick with the factory recommended tire pressure, if you have to get a a set of them valve caps that tell you when the presure is low...

[YarisOwnersDad]

Originally Posted by 07WYarisRS

WTF are yo guys serious?

you actually think a few PSI is going to save you MPG that you will be able to calculate?
The foot print has not been changed until max highway speed when the tires stretch to their limits, The engine still burns the same amount of fuel, the car still weighs the same... you have done nothing but shred 50K off your tires by over inflating them on such a light car... Guess what if you save $20 in the last year with the higher air pressure it just cost you $400 for new tires

Stick with the factory recommended tire pressure, if you have to get a a set of them valve caps that tell you when the presure is low...

I agree with you, except for the point you made about the footprint not being changed until the tires have been run at highway speeds.

I grant you, the footprint will get smaller when the tires are warm, which causes the psi to go up by two or three pounds over cold pressure, but if the footprint is already reduced by over-inflation, then it will become even smaller at the higher temperatures.

At least that's my understanding. I don't claim to be a tire expert.

(But...






















































I DID stay at a Holiday Express last night.)

Tom

[1stToyota]

Originally Posted by YarisOwnersDad

I agree with you, except for the point you made about the footprint not being changed until the tires have been run at highway speeds.

I grant you, the footprint will get smaller when the tires are warm, which causes the psi to go up by two or three pounds over cold pressure, but if the footprint is already reduced by over-inflation, then it will become even smaller at the higher temperatures.

At least that's my understanding. I don't claim to be a tire expert.

(But... I DID stay at a Holiday Express last night.)

Tom

You'll get an instant change in the footprint. Get a tape measure reading of what's hitting the pavement @ 32psi, then run it up to 60psi and see how the tire gets up on its tippy-toes.