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Tire PRESSURE
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| | #1 |
| Member Join Date: Jul 2008 Location: Frederick, Colorado
Posts: 70
My Car: 2008 Prius Model: Package: #5 Thanks: 0
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Friends: 0 | I've Read all the posts and put my tires at 44/42 My milage dropped, the road noise is more noticeable, plus the bumpier ride.![]() So whats next ![]() I was going to try backing off 2 psi at a time. |
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| | #2 | |
| Senior Member Join Date: Apr 2008 Location: Pennsylvania
Posts: 864
My Car: 2008 Prius Model: Package: #6 Thanks: 41
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![]() ... Brad | |
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| | #3 |
| Senior Member Join Date: Jan 2004 Location: Minnesota
Posts: 5,491
My Car: 2012 Prius Plug-in Model: Plug-in Advanced Package: No Package Thanks: 137
Thanked 960 Times in 501 Posts
Friends: 22 | That is almost certainly not related to tire pressure. Softer for a better ride is a tradeoff for efficiency. Those hypermilers who recommend PSI beyond the maximum have proven the improvement. And our data shows at the maximum offers a benefit, just not as much. I suggest collecting more data. It takes a few tanks before you truly get a feel for MPG, due to the many other influencing factors at play. . |
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| | #4 |
| Senior Member Join Date: Aug 2008 Location: Albany Ga.
Posts: 771
My Car: 2010 Prius Model: III Package: N/A Thanks: 19
Thanked 56 Times in 50 Posts
Friends: 0 | The higher the tire pressure, the lower the rolling resistance. Like everything, there is a point of diminishing returns, but the resistance should not increase. Maybe your fuel blend changed? |
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| | #5 |
| Member Join Date: Jul 2008 Location: Frederick, Colorado
Posts: 70
My Car: 2008 Prius Model: Package: #5 Thanks: 0
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Friends: 0 | 46.9 mpg . 2,016 mileage44/42tire pressure= noisy and bumpy ride ![]() lowered tire pressure to 42/40 |
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| | #6 |
| C'Mere Sheepie! Join Date: Mar 2008 Location: Sanford FLorida
Posts: 1,100
My Car: 2008 Prius Model: Package: #2 Thanks: 1
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Friends: 7 | 42/40 is what I have used for a while now. usually sitting around 50mpg at lowest end and around 53-55 avg high end. I drive 90% highway at 60-65mph. |
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| | #7 |
| Touring Member Join Date: May 2008 Location: Whittier, CA
Posts: 62
My Car: 2008 Prius Model: Package: #6 Touring Thanks: 2
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Friends: 2 | I worked in a tire store as a youth and learned to always run my tires at their maximum pressure for tire wear purposes. I suppose that I have gotten used to the harsher ride associated with "hard" tires. My touring model allows 51 PSI - and I take it up to the max. I am averaging 56 MPG and think that the tire pressure helps me to some degree. Plus the tire wear advantage. |
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| | #8 |
| Your Friendly Moderator Join Date: May 2004 Location: Far-North Chicagoland
Posts: 13,920
My Car: 2004 Prius Model: Package: #9 Thanks: 251
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Friends: 33 | I am not gong to tell you to over-inflate your tires. In fact, I was bashed in the Chicago Sun Times for making such suggestions. So what you do with your car, your money, and your property is entirely up to you. That should satisfy my lawyer. If you click the "Current Mileage" link in my signature you'll see my lifetime chart. I originally over-inflated my tired in August of '06. You will notice a very discernible departure between the temp/mileage lines at that time. In fact, that one point in time is the only time I have ever seen two consecutive tanks go opposite the temperature. Even as the temperature went down, my mileage went up. It is my experience that over-inflating my tires has improved my mileage.
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| | #9 |
| Geek Join Date: Jul 2008
Posts: 84
My Car: 2008 Prius Model: Package: N/A Thanks: 0
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Friends: 0 | On somewhat related topic. My original tires were under inflated when delivery (33/32) Now I have 38/36, not sure if there any improvements on MPG yet. But I do notice the control of the car is slightly different (esp on rainy day!) It could be the lower rolling resistance, I found Prius handling is not as good as the cars I have driven before. Not sure how to describe, but it seems more sensitive or maybe I should say it is less wanted to stay on the road. I am just a bit worry during winter... Not sure how's the handling is like... |
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| | #10 | |
| P719 of ??? Join Date: Nov 2006 Location: South Jersey
Posts: 4,486
My Car: 2010 Prius Model: V Package: Adv. Technology Thanks: 2
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| pressure, tire |
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I've Read all the posts and put my tires at 44/42 My milage dropped, the road noise is more noticeable, plus the bumpier ride.








46.9 mpg . 2,016 mileage
lowered tire pressure to 42/40





