View Poll Results: What gas do you put into your 2RX?
Premium
0
0%
Medium
0
0%
Regular Unleaded
0
0%
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Do you need Premium Gas in the 2RX (merged discussion threads)
06-19-09, 07:53 AM
#392
Lexus Champion
ecm is mapped for Premium fuel,even on the early models. Thats why Premium fuel is recommended. Yes the early models will run on 87 octane,because it`s not said Premium Only. When it states Premium Fuel only! you had better stick to it. At least if you want longevity from the motor.
06-19-09, 09:25 AM
#393
Driver School Candidate
Join Date: Jan 2004
Location: Kansas
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06-19-09, 09:29 AM
#394
Pole Position
Join Date: Jul 2008
Location: WA
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Yes, I know that this issue has been beaten to a pulp. Just add my 2 cents
06-19-09, 11:39 AM
#395
Here's my logic for my 2005....
Manual states:
"For improved vehicle performance, the use of
premium unleaded gasoline with an Octane Rating 91
(Research Octane Number 96) or higher is recommended."
Premium is about $.20 more than regular. That equates to $3.00 per tank.
I get about 1-2 miles per gallon more with premium.
For me the decision is easy. I use premium.
Manual states:
"For improved vehicle performance, the use of
premium unleaded gasoline with an Octane Rating 91
(Research Octane Number 96) or higher is recommended."
Premium is about $.20 more than regular. That equates to $3.00 per tank.
I get about 1-2 miles per gallon more with premium.
For me the decision is easy. I use premium.
06-19-09, 07:16 PM
#397
Driver School Candidate
Join Date: Jun 2009
Location: CO
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RX 3.3 regular gas
I live at 10,000 ft in the mountains outside of Denver. I have used only regular gas ( the owners manual said it was OK ) I have 90K on the car without any problem, a 2005. I also get 24+ mpg
06-21-09, 03:55 AM
#398
Driver School Candidate
Join Date: Nov 2008
Location: VA
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A couple of things:
1. I hate Sam's Club, Walmart, but the gas is great. It's the only station in our area where I can get gas without ethanol. I assume that unlike other companies who share distributors/gas, Sam's has its own distribution system like it has for everything else.
2. Question: I know that for normal driving, knock sensors allow the use of lower octane fuel than the engine was set to use. However, knock sensor failure seems to be a somewhat frequent occurrence, they're not that cheap, and the RX has several. Does anyone know if the knock sensor is the kind of component that the harder/more it works, the sooner it wears out? If that's the case, could it be cheaper in the long run not to rely on knock sensors to adjust ignition timing and just run the octane for which the vehicle is optimized?
1. I hate Sam's Club, Walmart, but the gas is great. It's the only station in our area where I can get gas without ethanol. I assume that unlike other companies who share distributors/gas, Sam's has its own distribution system like it has for everything else.
2. Question: I know that for normal driving, knock sensors allow the use of lower octane fuel than the engine was set to use. However, knock sensor failure seems to be a somewhat frequent occurrence, they're not that cheap, and the RX has several. Does anyone know if the knock sensor is the kind of component that the harder/more it works, the sooner it wears out? If that's the case, could it be cheaper in the long run not to rely on knock sensors to adjust ignition timing and just run the octane for which the vehicle is optimized?
06-21-09, 09:17 PM
#399
Knock sensors are always working, regardless of whether or not a knock (pre-ignition) actually occurs. They essentially monitor the cylinders as "microphones" listening in for certain frequencies. Knock sensers do not fail based on the number of times they prevent or retard a knock. They fail with age due to heat, vibration, etc.
One thing I did learn about knock sensors is they pretty much do not work at high RPMs (>4,000) because they just cant keep up in real time. However, virtually all knocks occur at 2,000 RPM or less, and our drive-by-wire systems help prevent knock in the first place by preventing abrupt changes in fuel delivery as they relate to timing.
moral of the story: if you drive hard, probably wanna stick with premium. if youre soft on the pedal, regular is fine. Like anything else, its a personal choice, so take care of your car knowing the pros and cons
One thing I did learn about knock sensors is they pretty much do not work at high RPMs (>4,000) because they just cant keep up in real time. However, virtually all knocks occur at 2,000 RPM or less, and our drive-by-wire systems help prevent knock in the first place by preventing abrupt changes in fuel delivery as they relate to timing.
moral of the story: if you drive hard, probably wanna stick with premium. if youre soft on the pedal, regular is fine. Like anything else, its a personal choice, so take care of your car knowing the pros and cons
06-26-09, 04:27 AM
#401
Pole Position
28MPG? Is this a AWD vehicle?
06-28-09, 12:46 PM
#404
Pole Position
I feel better now
06-29-09, 06:08 AM
#405
The RX350's will give you better mileage if premium is used. And somebody did a calculation showing the additional cost for the gas justifies the mileage uptick. Try it some time, do your own testing. As we say, do a DOE.