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Tires pressure on 2009 prius?

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Old 02 Oct 2011, 05:24 pm   #1 (permalink)
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Default Tires pressure on 2009 prius?
Hi can i inflate tires on my prius to 44/42? the manual says they should be 35/32 but i want to get better mielage(im getting 41mpg) thanks
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Old 02 Oct 2011, 05:39 pm   #2 (permalink)
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OVER 9000!
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Old 02 Oct 2011, 05:54 pm   #3 (permalink)
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Passenger vehicles all get best mpg at 35-36 psi. You can go to the max (usually 40psi) stamped right on the tire, but your ride will feel like a brick on a roller skate. Anyway, that max pressure is only for giving the entire football offensive line a ride home. Also, that max psi means a shorter life for your struts. Stay with the 35-36. If you want noticeable mpg improvement, then drive with your ears. Ears detect both sound and motion. The idea is smooth sound and smooth motion. Your ears are far better than any tach meter.
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Old 02 Oct 2011, 06:09 pm   #4 (permalink)
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I go with 60 psi and get 66mpg
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Old 02 Oct 2011, 06:40 pm   #5 (permalink)
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I would not inflate past 40 PSI. I've done this on my Prius and the results are marginal - may be an extra 1 mpg at best. Not only do you get a rock hard ride, but it changes the way the vehicle manuevers, especiall y on wet surfaces. If you want better gas mileage I would recommend the following:































(1) Slowly ramp up speed - no jack rabbit starts.















(2) Turn off the Air Conditioner if you do not need it - this usually makes a 2 to 3 MPG difference.















(3) Slow down. You'll notice a 1 to 2 MPG improvement by keeping your max speed 3 to 4 miles under the speed limit.















(4) Use 0W - 30W synthetic oil. This especially helps in cold weather. It costs more, but you can run longer between oil changes to offset the cost.
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Old 02 Oct 2011, 07:09 pm   #6 (permalink)
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Look on the sidewall to be sure that the tire are rated for that (the OE tires are, but you may not have the OE tires on). If so then yes you can.































On my Prius there isn't any noticable difference in the ride.































In wet weather the chance of hydroplaning is reduced.































Braking distances are shorter.































Resistance to pot-hole damage is increased.































Handling is crisper.
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