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Hatchbacks Toyota Yaris Toyota Yaris Real-World MPG
472 messages, Last post on Oct 23, 2009 at 11:40 AM
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Replying to: lhanson (Jul 23, 2006 3:36 am) 
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10 days ago, the odometer on my 2008 Yaris Liftback turned 1,000 miles. Usually by this mileage I find that I can count on the mileage I'm getting to be fairly consistent, as the car engine is broken in, the rings are seated and it's time to get some accurate readings. I decided to install a ScanGauge II to provide real time mileage. The installation was a snap which only took about 15 minutes. In addition, it offers many other functions as you will see in the enclosed link. (source) http://www.scangauge.com/ The other area I've continued to experiment with is tire inflation pressure. Typically the auto manufacturers list a number that is arrived at from a number of considerations. One of the more influential consideration is tire noise, and ride quality. Therefore the number listed on the door sticker is usually at least 5 to 15 psi lower than the pressure that will return the best mileage. Another fact to be aware of is you can use the number printed on the side of the tire. Many people think this is unsafe, but to the contrary it's perfectly safe and it's the reason that the tire manufacturer lists it on the sidewall. Without that number there would be no way to know the upper limit of both inflation pressure and the tires load carrying capacity (the number that follows the inflation number) . That said, there is one drawback if one chooses to use the max inflation pressure and that it that it will wear the center tread faster that the tread near the shoulder of the tire. Just like under inflation wears the outside shoulders and leaves the center of the tire with lots of tread remaining. What I have found through recording the data supplied by the Scangauge II and trying a wide range of tire pressures, is that I get the best mileage with the tires on the Yaris at 12 psi over the door sticker. I will continue to monitor the wear, but expect it to be even across the entire tread, as I have used 10 psi over in the past with no problem whatsoever. However that was with other models of cars and each has it's own unique response to tire pressures. For more tire info, here is a link (source) http://www.michelinman.com/glossary/#u Since the installation of the ScanGauge II and choosing to run 12 psi over sticker, I have ran through three tanks of gas, and I'm now on my fourth. (I drive a lot). The first tank was very close to 50/50 city/freeway and returned 36mpg. The second tank was nearly 95% freeway  68 mph and returned 44mpg. The third tank was very, very mixed, therefore hard to estimate how much city vs freeway driving, that tank returned 37mpg. At this point, I'm very satisfied with the results and the more I drive it, the better I like this car. I especially enjoy the ScanGauge as it's a great reminder which helps me drive in a much more consistent way with an eye on mileage. Finally there is nothing like measurable results. Facts, not seat of the pants estimates. Cheers!
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Replying to: podred (Jan 18, 2008 5:56 pm)
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Replying to: yi5hedr3 (Jan 24, 2008 5:16 pm) |
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Sorry for the typo ! t was not until people were responding to 12 psi over that I noticed that indeed what I typed was wrong and not what I carry in my tires. What I meant to post is that I carry 5psi over for a total of 37 psi instead of the 32 on the door label. I have found that this is the sweet spot, for the tires on my Yaris. I carry a tread depth gauge and weekly perform tire pressure and tread depth operations. I also rotate and balance my tires twice a year. This is how I always obtain extremely good life from my tires. I have been doing this for years with every car I have and it's really worth the effort. I always run my tires over the mfg suggested pressure but not 5 psi on every car. Some less, some a bit more, as I base it on taking readings with the tread depth gauge on a regular basis. By monitoring wear and determining what each vehicle needs for pressure, I'm able to extend tire life and obtain even tread depth across the entire surface of the tire. It is not unusual for me to obtain at least 20% greater life than stated for a particular brand and model of tire. Thanks for calling that typo to my attention. |
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I run the 44 lbs. maximum shown on the sidewall, and have for the past 14,000 miles. My Yaris HB has 16,000 miles. Tire wear is very even across the tires. I know of many other hypermilers doing the same, and no problem with uneven tire wear. I have 8/32 tread depth front, and 6/32 tread wear rear. As you many know, the original equipment tires wear rather fast. There are much better tires as replacements.
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Replying to: fastrunner (Feb 02, 2008 4:12 pm) Thanks! |
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To anyone who is inflating their Yaris's tires to 44 psi: I say to you, please desist!! It's potentially very dangerous. Like most people, I usually inflate several psi higher than the door jamb sticker. That means 35psi for my Alero 4cyl. But 44psi is really pushing the limits of the Yaris's tiny tires. Plus, you're promoting premature tire wear because less of the tread is touching the pavement at that pressure. Finally, and most importantly, you're seriously risking a catastrophic hydroplaning event!! The Yaris is light enough the way it is; with super-pumped tires, it'll skate over a rainpuddle and land you in a ditch. Please, the few mpg you save aren't worth your life.
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All one has to do is lookup the actual facts. Not opinions. 44psi is stamped on the side of the tire so that one knows the load limit and psi ceiling that is perfectly safe to use. Every tire sold, has that data on the sidewall for a reason. That reason is safety. There is no reason not to inflate to maximum pressure if that is what one wants to do.
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Replying to: podred (Feb 10, 2008 9:54 am) On two gas saving webpages, which I am not allowed to show here, most are doing the max shown on the sidewall. None are having problems, and all are getting better mileage. I do not think there is a safety problem with going up to the max on the sidewall. Tire wear is normal.
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