- #19 of 68
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Re: So many threads, so LITTLE time.... [yaris46]
by waterboy5
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Aug 16, 2006 (11:14 pm)
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Replying to: yaris46 (Aug 14, 2006 2:04 pm)
sorry took so long to reply, inside the door jam has the recommended pressures, but the cold press on my tires is 44lbs, the door jam says 32lbs, I put 35lbs in all 4, seems to give good stability, and it is very important in the gas mileage game to keep them properly inflated, and if anyone is going to purchase one of these cars, HOLD OUT for a manual transmission!! people who are complaining about poor gas mileage more than likely have auto trans and they are driving them like a huge heavy SUV, imagine an egg under the gas pedle, monitor your tire pressure frequently, dont over rev the engine, dont oversteer at highway speeds and you will get the results I am getting, 42.3 mpg! 
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- #20 of 68
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Re: So many threads, so LITTLE time.... [waterboy5]
by lhanson
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Aug 17, 2006 (1:06 pm)
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Replying to: waterboy5 (Aug 16, 2006 11:14 pm)
I agree with everything you say except the 35 lbs. If the cold pressure is 44 lbs, then why not put it up to 42 lbs, they still won't go up to more than 44 even when hot. If you are driving on snow and ice (not much of a concern now)you might want to lower it a little bit for better traction. Your ride may be a little bumpier at 42 lbs, but who cares when we are maxing out our MPG. I have been getting 38.4 MPG in town with my MT Yaris hatchback driving just like you say.
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- #21 of 68
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just FYI
by nippononly
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Aug 17, 2006 (1:15 pm)
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the manufacturer's recommended tire pressure isn't purely random - they are attempting to maximize TRACTION (which will definitely decrease if you run around with the tires at 44 psi) and tire life (which will also be affected), in addition to fuel economy.
I might go 10% higher than the recommendation (which would be 35 in the Yaris), but not more, for those reasons. Usually I just follow the manufacturer recommendations.
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- #22 of 68
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Re: just FYI [nippononly]
by lhanson
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Aug 17, 2006 (7:04 pm)
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Replying to: nippononly (Aug 17, 2006 1:15 pm)
Wouldn't the money saved on gas more than make up for the decreased tread life, especially if we are not laying rubber on take off, accelerating in and out of traffic, tailgating, not anticpating red lights and slamming the brakes at the last second (all this is done in order to take 1 or 2 minutes off a morning commute). We are not talking NASCAR here, if a tire is rated at 44 psi, we should be able to safely run it at 42 psi. I am sure that the tire manufacturer is padding his rating by at least a couple psi for liability purposes.
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- #23 of 68
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at
by nippononly
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Aug 17, 2006 (11:34 pm)
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42 to 44 psi, most of your tire's contact patch is barely touching the ground. You ever seen tires where the center line of the tread is worn smooth, but the outside parts of the tread are still almost new? That's what your tires will look like after 18 months if you keep them pumped that high. And as far as water dispersal and traction for stopping and starting, you might as well put bicycle tires on the car.
But yes, you will make 10-20% better fuel economy, probably. Which will save you probably $100-200 per year (at 12,000 miles per year), for which you will pay by going through your $300 set of tires maybe twice as fast as you otherwise would, costing you around half your savings. So is saving $50-100 per year worth compromising your tire traction? It's a decision only you can make.
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- #24 of 68
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Re: at [nippononly]
by waterboy5
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Aug 18, 2006 (1:13 am)
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Replying to: nippononly (Aug 17, 2006 11:34 pm)
Just a little tidbit I heard about tire wear, did you know that as a tire is rolling on the road, it actually stops for a split second, and that split second is the reason tires wear out, makes ya go hmmmmmmmm. Anyway I am dealing with EXTREME heat here in Texas right now and thats why I dont go any higher than 35lbs in the tires, maybe as it cools off here I will add 2 or 3 more lbs in em.
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- #25 of 68
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Re: at [nippononly]
by lhanson
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Aug 18, 2006 (2:31 am)
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Replying to: nippononly (Aug 17, 2006 11:34 pm)
The following link would seem to indicate that you are right and I am wrong. The 32 PSI on the door trumps the 44 PSI on the tire. I just find it hard give up that much tire capability knowing what it will do to my MPG.
www.nhtsa.dot.gov/cars/rules/TireSafety/ridesonit/brochure.html
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- #26 of 68
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Re: So many threads, so LITTLE time.... [waterboy5]
by ap_n_yaris
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Aug 26, 2006 (3:04 pm)
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Replying to: waterboy5 (Aug 16, 2006 11:14 pm)
I use 34 psi cold, it seems to be working fine, also used nitrogen to fill tires, the molecule is alot bigger than O2.
alot less room for error. also on door car has gvwr 3280 lbs
what does it really weigh?
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- #27 of 68
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GVWR
by nippononly
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Aug 28, 2006 (7:24 am)
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is the TOTAL weight the car can carry, including its own weight. The curb weight of the Yaris with a manual transmission is 2293 pounds. That is the weight with nobody and nothing in it. If yours is an automatic then it weighs about 40 pounds more when empty.
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- #28 of 68
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Re: GVWR [nippononly]
by lucynethel
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Aug 29, 2006 (3:25 pm)
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Replying to: nippononly (Aug 28, 2006 7:24 am)
The scariest thing about this car to ME, is that with myself & my wife, add a 30 pack of beer and we are OVER the GVRW rating...... 
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