A reason I can't get rid of this car..mpg's ROCK!!
05-11-14, 05:46 PM
#1
Pit Crew
Thread Starter
A reason I can't get rid of this car..mpg's ROCK!!
So just took a. Trip to Raleigh nc from Charlotte nc and managed 31.2 there and total round trip of 29.5 (off the highway city driving lowered the average).
2001 ls430 @ 171,000 miles. Tires at 38-40psi. Two passengers windows up ac on at 70mph average.
All my friends are jealous lol. Bravo Lexus.
2001 ls430 @ 171,000 miles. Tires at 38-40psi. Two passengers windows up ac on at 70mph average.
All my friends are jealous lol. Bravo Lexus.
05-12-14, 08:47 PM
#6
Wildly impressive mileage, but aren't your tires wearing out in the center of the tread?
Would really hesitate using cold tire 40psi then rolling down the roads for a few hours of 75mph on a hot summer day.
Recipe for a blowout.
Would really hesitate using cold tire 40psi then rolling down the roads for a few hours of 75mph on a hot summer day.
Recipe for a blowout.
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05-13-14, 05:52 AM
#8
Interesting note about tire pressure from Tire Rack...
Summary: Tire pressure changes about 1 psi per 10 degrees of temperature.
and... from starting pressure driving for 30 minutes could increase tire pressure 5 psi...
You may have set your pressure at 40 psi when you started, but after a few minutes of driving your PSI will be much more.
from Tirerack.com:
The rule of thumb is for every 10° Fahrenheit change in air temperature, your tire's inflation pressure will change by about 1 psi (up with higher temperatures and down with lower).
In most parts of North America, the difference between average summer and winter temperatures is about -50° Fahrenheit...which results in a potential loss of about 5 psi as winter's temperatures set in. And a 5 psi loss is enough to sacrifice handling, traction, and durability!
Additionally, the difference between cold nighttime temperatures and hot daytime temperatures in most parts of the country is about 20° Fahrenheit. This means that after setting tire pressures first thing in the morning, the vehicle's tire pressures will be almost 2 psi higher when measured in the afternoon (if the vehicle was parked in the shade). While that is expected, the problem is when you set your vehicle's tire pressures in the heat of the day, their cold pressures will probably be 2 psi low the following morning.
And finally, if the vehicle is parked in the sun, the sun's radiant heat will artificially and temporarily increase tire pressures.
We put some of these theories to the test at the Tire Rack. First, we mounted two tires on wheels. We let them sit overnight to equalize and stabilize their temperatures and pressures. The following morning we set them both to 35 psi. One tire and wheel was placed in the shade while the other was placed directly in the sun. We then monitored the ambient temperatures, tire temperatures and tire pressures through the day. As the day's temperatures went from 67° to 85° Fahrenheit, the tire that was kept in the shade went from our starting pressure of 35 psi to a high of 36.5 psi. The tire that was placed in the sun and subject to the increase in ambient temperature plus the sun's radiant heat went from our starting pressure of 35 psi to a high of 40 psi. In both cases, if we had set our tire pressures in the afternoon under the conditions of our evaluation, they would have been between 2 and 5 psi low the following morning.
Next we evaluated the effects of heat generated by the tire's flexing during use. We tried to eliminate the variable conditions we might encounter on the road by conducting this test using our "competition tire heat cycling service" that rolls the tires under load against the machine's rollers to simulate real world driving. We monitored the changes in tire pressure in 5-minute intervals. The test tires were inflated to 15 psi, 20 psi, 25 psi and 30 psi. Running them all under the same load, the air pressure in all of the tires went up about 1 psi during every 5 minutes of use for the first 20 minutes of operation. Then the air pressures stabilized, typically gaining no more than 1 psi of additional pressure during the next 20 minutes. This means that even a short drive to inflate your tires will result in tires that will probably be under-inflated by a few psi the following morning.
Summary: Tire pressure changes about 1 psi per 10 degrees of temperature.
and... from starting pressure driving for 30 minutes could increase tire pressure 5 psi...
You may have set your pressure at 40 psi when you started, but after a few minutes of driving your PSI will be much more.
from Tirerack.com:
The rule of thumb is for every 10° Fahrenheit change in air temperature, your tire's inflation pressure will change by about 1 psi (up with higher temperatures and down with lower).
In most parts of North America, the difference between average summer and winter temperatures is about -50° Fahrenheit...which results in a potential loss of about 5 psi as winter's temperatures set in. And a 5 psi loss is enough to sacrifice handling, traction, and durability!
Additionally, the difference between cold nighttime temperatures and hot daytime temperatures in most parts of the country is about 20° Fahrenheit. This means that after setting tire pressures first thing in the morning, the vehicle's tire pressures will be almost 2 psi higher when measured in the afternoon (if the vehicle was parked in the shade). While that is expected, the problem is when you set your vehicle's tire pressures in the heat of the day, their cold pressures will probably be 2 psi low the following morning.
And finally, if the vehicle is parked in the sun, the sun's radiant heat will artificially and temporarily increase tire pressures.
We put some of these theories to the test at the Tire Rack. First, we mounted two tires on wheels. We let them sit overnight to equalize and stabilize their temperatures and pressures. The following morning we set them both to 35 psi. One tire and wheel was placed in the shade while the other was placed directly in the sun. We then monitored the ambient temperatures, tire temperatures and tire pressures through the day. As the day's temperatures went from 67° to 85° Fahrenheit, the tire that was kept in the shade went from our starting pressure of 35 psi to a high of 36.5 psi. The tire that was placed in the sun and subject to the increase in ambient temperature plus the sun's radiant heat went from our starting pressure of 35 psi to a high of 40 psi. In both cases, if we had set our tire pressures in the afternoon under the conditions of our evaluation, they would have been between 2 and 5 psi low the following morning.
Next we evaluated the effects of heat generated by the tire's flexing during use. We tried to eliminate the variable conditions we might encounter on the road by conducting this test using our "competition tire heat cycling service" that rolls the tires under load against the machine's rollers to simulate real world driving. We monitored the changes in tire pressure in 5-minute intervals. The test tires were inflated to 15 psi, 20 psi, 25 psi and 30 psi. Running them all under the same load, the air pressure in all of the tires went up about 1 psi during every 5 minutes of use for the first 20 minutes of operation. Then the air pressures stabilized, typically gaining no more than 1 psi of additional pressure during the next 20 minutes. This means that even a short drive to inflate your tires will result in tires that will probably be under-inflated by a few psi the following morning.
05-13-14, 06:10 AM
#9
Interesting note about tire pressure from Tire Rack...
Summary: Tire pressure changes about 1 psi per 10 degrees of temperature.
and... from starting pressure driving for 30 minutes could increase tire pressure 5 psi...
You may have set your pressure at 40 psi when you started, but after a few minutes of driving your PSI will be much more.
from Tirerack.com:
The rule of thumb is for every 10° Fahrenheit change in air temperature, your tire's inflation pressure will change by about 1 psi (up with higher temperatures and down with lower).
In most parts of North America, the difference between average summer and winter temperatures is about -50° Fahrenheit...which results in a potential loss of about 5 psi as winter's temperatures set in. And a 5 psi loss is enough to sacrifice handling, traction, and durability!
Additionally, the difference between cold nighttime temperatures and hot daytime temperatures in most parts of the country is about 20° Fahrenheit. This means that after setting tire pressures first thing in the morning, the vehicle's tire pressures will be almost 2 psi higher when measured in the afternoon (if the vehicle was parked in the shade). While that is expected, the problem is when you set your vehicle's tire pressures in the heat of the day, their cold pressures will probably be 2 psi low the following morning.
And finally, if the vehicle is parked in the sun, the sun's radiant heat will artificially and temporarily increase tire pressures.
We put some of these theories to the test at the Tire Rack. First, we mounted two tires on wheels. We let them sit overnight to equalize and stabilize their temperatures and pressures. The following morning we set them both to 35 psi. One tire and wheel was placed in the shade while the other was placed directly in the sun. We then monitored the ambient temperatures, tire temperatures and tire pressures through the day. As the day's temperatures went from 67° to 85° Fahrenheit, the tire that was kept in the shade went from our starting pressure of 35 psi to a high of 36.5 psi. The tire that was placed in the sun and subject to the increase in ambient temperature plus the sun's radiant heat went from our starting pressure of 35 psi to a high of 40 psi. In both cases, if we had set our tire pressures in the afternoon under the conditions of our evaluation, they would have been between 2 and 5 psi low the following morning.
Next we evaluated the effects of heat generated by the tire's flexing during use. We tried to eliminate the variable conditions we might encounter on the road by conducting this test using our "competition tire heat cycling service" that rolls the tires under load against the machine's rollers to simulate real world driving. We monitored the changes in tire pressure in 5-minute intervals. The test tires were inflated to 15 psi, 20 psi, 25 psi and 30 psi. Running them all under the same load, the air pressure in all of the tires went up about 1 psi during every 5 minutes of use for the first 20 minutes of operation. Then the air pressures stabilized, typically gaining no more than 1 psi of additional pressure during the next 20 minutes. This means that even a short drive to inflate your tires will result in tires that will probably be under-inflated by a few psi the following morning.
Summary: Tire pressure changes about 1 psi per 10 degrees of temperature.
and... from starting pressure driving for 30 minutes could increase tire pressure 5 psi...
You may have set your pressure at 40 psi when you started, but after a few minutes of driving your PSI will be much more.
from Tirerack.com:
The rule of thumb is for every 10° Fahrenheit change in air temperature, your tire's inflation pressure will change by about 1 psi (up with higher temperatures and down with lower).
In most parts of North America, the difference between average summer and winter temperatures is about -50° Fahrenheit...which results in a potential loss of about 5 psi as winter's temperatures set in. And a 5 psi loss is enough to sacrifice handling, traction, and durability!
Additionally, the difference between cold nighttime temperatures and hot daytime temperatures in most parts of the country is about 20° Fahrenheit. This means that after setting tire pressures first thing in the morning, the vehicle's tire pressures will be almost 2 psi higher when measured in the afternoon (if the vehicle was parked in the shade). While that is expected, the problem is when you set your vehicle's tire pressures in the heat of the day, their cold pressures will probably be 2 psi low the following morning.
And finally, if the vehicle is parked in the sun, the sun's radiant heat will artificially and temporarily increase tire pressures.
We put some of these theories to the test at the Tire Rack. First, we mounted two tires on wheels. We let them sit overnight to equalize and stabilize their temperatures and pressures. The following morning we set them both to 35 psi. One tire and wheel was placed in the shade while the other was placed directly in the sun. We then monitored the ambient temperatures, tire temperatures and tire pressures through the day. As the day's temperatures went from 67° to 85° Fahrenheit, the tire that was kept in the shade went from our starting pressure of 35 psi to a high of 36.5 psi. The tire that was placed in the sun and subject to the increase in ambient temperature plus the sun's radiant heat went from our starting pressure of 35 psi to a high of 40 psi. In both cases, if we had set our tire pressures in the afternoon under the conditions of our evaluation, they would have been between 2 and 5 psi low the following morning.
Next we evaluated the effects of heat generated by the tire's flexing during use. We tried to eliminate the variable conditions we might encounter on the road by conducting this test using our "competition tire heat cycling service" that rolls the tires under load against the machine's rollers to simulate real world driving. We monitored the changes in tire pressure in 5-minute intervals. The test tires were inflated to 15 psi, 20 psi, 25 psi and 30 psi. Running them all under the same load, the air pressure in all of the tires went up about 1 psi during every 5 minutes of use for the first 20 minutes of operation. Then the air pressures stabilized, typically gaining no more than 1 psi of additional pressure during the next 20 minutes. This means that even a short drive to inflate your tires will result in tires that will probably be under-inflated by a few psi the following morning.
40PSI will not burst his tire but they will ride rough compared to the manufacturer recommended 32-33 PSI depending on which LS model you have.
05-13-14, 06:36 AM
#10
So many have no idea... I posted as was helping a neighbor kid (he's in his 20s) and both front tires had 45 psi in them... because the max pressure on the tire said 51, so he thought 45 would be OK... I knew of the 1 psi per 10 degrees, but was not sure of the psi increase due to driving... that it could be as high as 5 psi... that part was new to me. I too like to check mine in the morning, in the garage.
05-13-14, 07:06 AM
#11
Pit Crew
Thread Starter
Th tires were consistent with around low. 40's. The tires are no where near being new so I'm not worried too much about the center wearing. By the time that happens, I would probably be overdue for a new set lol.
I hate that I'm considering selling it in order to fund a nice diesel truck and car trailer. Tis is life though.
I hate that I'm considering selling it in order to fund a nice diesel truck and car trailer. Tis is life though.
05-13-14, 07:33 AM
#12
I been averaging around 22.5 per tank and on the highway doing 75 mph I usually get between 27-28 mpg with the A/C on. Not bad for a 2001 Ultra luxury edition with 122k miles on it. My friend has a 2001 camry that gets about the same mpg's
05-13-14, 08:40 AM
#13
Exactly my point to many people... there is no need to sacrifice luxury to get decent mileage.... unless you're talking a civic or something that gets 35+mpg... but then who wants to go there...
