| View previous topic :: View next topic |
| Author |
Message |
johncooper421
Joined: 04 Mar 2008
Posts: 12
|
| Posted: 8/21/08 12:42PM Post subject: Tire\fuel mileage question |
|
|
| I recently replaced the stock tires on my factory 15" alloy wheels of my 2006.5 Xb with some P195/60R-15 87T Pirelli Cinturato P3000 85,000 mile tires inflated to 30 PSI, and had the wheels aligned shortly thereafter to the specified range. After replacing the tiresl, I have noticed lower MPG (from 30 to 26 MPG). I'm thinking it may be due to the tires being a little bit wider than the stock P185s or due to the extra long life tread creating more friction... I'm gonna get the alignment checked again soon because the car is still pulling a bit. What do you all think? |
|
| Back to top |
|
Driver_Lost
Joined: 27 Jan 2005
Posts: 721
Location: North West Arkansas
|
| Posted: 8/21/08 2:21PM Post subject: |
|
|
Put more air in them. 30psi is a little soft. Check your max. Its likely 44 psi, and keep it under that by a few.
I bumped my brides oem tires on the B from 32 to 36 cold and it picked up 4mpg.
New fresh tires (next week) I'll be running closer to 40
It makes a big difference. Didn't you listen to noboma? :silly: |
|
| Back to top |
|
ryuji16
Joined: 29 Jan 2007
Posts: 579
Location: Baldwin Park, CA (626)
|
| Posted: 8/21/08 2:26PM Post subject: |
|
|
adding to that, 195/60 are slightly bigger tires than the 185/60, so your odometer is reading slower than before. (go here if you need exact numbers: http://www.1010tires.com/TireSizeCalculator.asp )
have it checked to correct the pulling, but definitely pump those tires up at least to 36 psi and above. anything passed 38-40 will affect your ride quality |
|
| Back to top |
|
EAmon
Joined: 07 Jan 2008
Posts: 950
Location: 7 WON! 4
|
| Posted: 8/21/08 2:37PM Post subject: |
|
|
| im running 195/60-15 on the stock steelies and i keep mine pumped at 44psi |
|
| Back to top |
|
bB2NER
Joined: 31 May 2004
Posts: 11048
Location: God help us now
|
| Posted: 8/21/08 7:41PM Post subject: |
|
|
| Def. air them up to like 37-38 psi. Plus you have to remember your speedo is more accurate now. |
|
| Back to top |
|
hwybox
Joined: 28 Oct 2006
Posts: 445
Location: "big" O
|
| Posted: 8/22/08 5:58AM Post subject: |
|
|
| I just had the same issue, was gettin 30-33mpg switched to 195/60r-15 on my 15x7" wheels and my first tank was 25mpg kinda mad. Then I air them up to 36psi (was 30) and am now gettin 30mpg again on my last 3 tanks. I may have made an error on my first tank tho, dont know. |
|
| Back to top |
|
hwybox
Joined: 28 Oct 2006
Posts: 445
Location: "big" O
|
| Posted: 8/22/08 6:05AM Post subject: |
|
|
| Oh and btw my tires are Falken 512s Ziex, nice and they stick good but have good tead wear. My factory Goodyears were pretty much done at 22k miles. |
|
| Back to top |
|
Stylis
Joined: 28 Aug 2003
Posts: 6030
Location: Scion Evolution
|
| Posted: 8/22/08 8:03AM Post subject: |
|
|
| I am running kumo 195/60/15 stretched tires and still get 30-33MPG. I just have to pay attention to the speed limit. |
|
| Back to top |
|
WhoKilledTheJAMs
Joined: 18 Mar 2008
Posts: 286
Location: Fredonia, NY
|
| Posted: 8/22/08 3:43PM Post subject: |
|
|
When you calculate your mpg, multiply the miles on your odo by 1.02.
I am running 195/60/15 Kumhos @45psi, and I just had a 39mpg tank, combined with blocking off the bottom grille and driving very gently (I spend a lot of time rolling in neutral in town). |
|
| Back to top |
|
Sciond
Joined: 01 Nov 2004
Posts: 7352
Location: What's in your box...
|
| Posted: 8/22/08 5:20PM Post subject: |
|
|
Stylis wrote: I am running kumo 195/60/15 stretched tires and still get 30-33MPG. I just have to pay attention to the speed limit.
running same size and I get about the same going very fast a lot of the time |
|
| Back to top |
|
| |