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-   -   New tires and mileage dropped. (http://www.peachparts.com/shopforum/off-topic-discussion/280761-new-tires-mileage-dropped.html)

t walgamuth 07-09-2010 08:54 PM
Quote:
Originally Posted by G-Benz (Post 2502285)
I would think that would improve your gas mileage.

Unless your MPG comparisons are based on strictly controlled driving conditions, it's difficult to say that the tire swap had anything to do with it...although I concur with the possible change in the rolling resistance of the new tires.

Hotter weather requires more A/C usage...not to mention the engine works harder as well.

New tires grip better, giving a more confident road feel...and perhaps more aggressive driving and heavier pedal.

More stop-and-go driving this time around versus prior to the tire change?
A larger diameter tire would improve mileage most likely but because it makes the odometer accuracy change it also would most likely make your mileage LOOK worse. An accurate measurement of the diameter of the tire will tell the tale. Your mileage did not change all that much either so it can simply be calculating inaccuracy or measurement inaccuracy.

420benz 07-09-2010 08:56 PM
Quote:
Originally Posted by AdvisorGuy (Post 2502356)
I just checked - using 2006 as the model since you didn't post what year, but I do know that they used the same tire for several years so I'm probably spot-on with the size - 185/65R15.

The OE tire weighs 17lbs, actually 1lb lighter than the new "Assurance FuelMax" Low rolling resistance model, yet the "standard" Non-low rolling resistance Fuel Max is lighter than both at 16lbs.

EDIT: The Comfort Tred Touring weighs in at 18lbs each - one pound more than you're OE tire. Seems insignificant I know, but it does have an effect. The General Altimax HP's I put on my Sentra to replace the horrible Fuzions that came on it are 3lbs lighter per tire. I went from an average of 31.1 to 33.7mpg after the first tank, driving the same route, in the same manner, every day and has remained consistent in the 33.6-34.1mpg average.
It,s hard to believe that one pound per tire would make that much difference.Thanks for the info.

AdvisorGuy 07-09-2010 09:11 PM
Comfort Tred Touring: 24.5" overall diameter - 855 revolutions per mile.
OE tire: 24.4" overall diameter - same 855 revolutions per mile.

thorsen 07-09-2010 09:30 PM
The original tires were low rolling resistance (LRR). The Goodyears are not.

420benz 07-09-2010 11:02 PM
Quote:
Originally Posted by thorsen (Post 2502378)
The original tires were low rolling resistance (LRR). The Goodyears are not.
How does LRR effect MPG?

Craig 07-09-2010 11:05 PM
Quote:
Originally Posted by 420 benz (Post 2502427)
How does LRR effect MPG?
Here's some info:

http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=29

RichC 07-09-2010 11:13 PM
Rolling resistance values can make a big impact on fuel mileage.

But its almost impossible to get rolling resistance values of tires from the manufacturer.

A few points of difference in rolling resistance can cost you way more than the price
of the tire in added fuel use.

420benz 07-10-2010 10:01 AM
I should have asked you guys before i bought these tires.Great info THANKS.

AdvisorGuy 07-10-2010 10:21 AM
Since you have them now, try experimenting with a few more psi than Toyota recommends. Start with let's say 2-3 psi for one or two tanks to see if you can pick up a few mpg without impacting the ride too much. My last car had two sets of tire pressures listed on the inner fuel door - STANDARD (36/32) and HIGH SPEED (39/36) recommendations. Granted I had a much larger wheel/tire set-up than you (235/40R18), I played with the high speed settings for a few tanks and settled at 41/37. I regained the 2mpg I lost when I installed the set up over the stock 17 inch wheel/tire set up.

kknudson 07-10-2010 10:40 AM
Do you have winter / summer blends.

Here in IL I'll notice a few MPG drop during the summer when they change blends. (I rarely use the air, so I don't think that's an issue).

Pavka007 07-10-2010 10:40 AM
Quote:
Originally Posted by AdvisorGuy (Post 2502594)
Since you have them now, try experimenting with a few more psi than Toyota recommends. Start with let's say 2-3 psi for one or two tanks to see if you can pick up a few mpg without impacting the ride too much. My last car had two sets of tire pressures listed on the inner fuel door - STANDARD (36/32) and HIGH SPEED (39/36) recommendations. Granted I had a much larger wheel/tire set-up than you (235/40R18), I played with the high speed settings for a few tanks and settled at 41/37. I regained the 2mpg I lost when I installed the set up over the stock 17 inch wheel/tire set up.
Very good posting. A friend of mine is into VW Diesels and he can up his MPG on a long run by 8 to 9 MPG by pumping his tires 1 psi above high speed recommendation. The ride quality isn't that much different.

retmil46 07-10-2010 02:30 PM
On the Jeep CRD, the Chrysler dealer had the tires at 33 psi (44 psi rated tires) when I bought it. Bloody thing seemingly wouldn't coast ten feet when you took your foot off the pedal. Pumped them up to 40 psi, huge difference in coasting ability and fuel mileage.

Hatterasguy 07-10-2010 02:32 PM
On the Nissan Sentra we just bought my sister, part of the deal was that the dealer would put on new tires. They had them set to 26psi or something silly low, pumped them up to 35 and the car drives better.

Craig 07-10-2010 02:47 PM
I run my 123s in the low 30s, helps the mileage an feels a little tighter.

420benz 07-10-2010 06:54 PM
The Good Year dealer put 35 front 35 rear.
1.Should i go up t0 36/36?
2.Should i refill with nitrogen?
3.Should i do both?


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