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Gas: Premium vs. Regular advantages, disadvantages (merged threads)

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Old 11-02-07, 01:17 AM   #31
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Originally Posted by oldhotrod View Post
You guys all get too **** about the gas thing!! I had a '05 LS 430 that got 27 mpg at interstate speeds, (75-80 MPH), now have a '07 LS460 that gets 30 mpg at same speeds, both running on 87 Octane regular ONLY, mostly from Sam's Club. Rule #1--don't believe anything the sales people tell you!! Talk to the guys in the shop for the real info! Engine has sensors to compensate for lower octane gas. If your gonna run it at the Dragstrip put Premium in it, otherwise you're just wasting your money!!!
i am always curious, when you said 27mpg on the ls430 and 30mpg on the ls460, did you get the number by calculation, or from the trip computer? with the ls460 rated 24mpg on highway, i am curious how you can get 30mpg.
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Old 11-02-07, 07:22 AM   #32
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Premium fuel will give you maximum engine performance and gas mileage. However, in today's modern engines you can easily burn regular gas with no adverse effects on the engine itself, but performance and mileage will suffer.
I absolutely agree. Modern ECUs will adjust, but mileage will suffer.
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Old 11-02-07, 09:27 AM   #33
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I have owned my 05 LS430 for 8 months & driven it approx 7K miles. The window sticker has 18 city & 25 highway. Almost all my driving is in town which is has a lot of hills. The first 3K miles I ran regular & averaged about 16.5 MPG in town. The next 3K I ran 91 octane with average of about 16.7. There was really no difference in preformance or MPG. I am now back to regular at about 16.6. The one trip I took last month up into Oregon, I was getting right around 26/27 MPG using regular at 65/70 MPH. The following is a intresting state of Calif artical related to this topic.




http://www.consumerenergycenter.org/...s_premium.html
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Old 11-02-07, 10:53 AM   #34
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i am always curious, when you said 27mpg on the ls430 and 30mpg on the ls460, did you get the number by calculation, or from the trip computer? with the ls460 rated 24mpg on highway, i am curious how you can get 30mpg.

well remember that the LS460 was rated at 27 hwy before the 2008 epa change. i solely believe that the old standard was achievable but you had to pay so much attention on the road and see when you did not need to brake before you could achieve it.

for instance, my RX is rated at 24 hwy and ive gotten 25 before (according to the avg mpg from the trip computer). i had just gotten a fill up and went directly onto the hwy for an hour trip and achieved 25. to me, getting 30 might be a little exagerated in this case, but its definately possible. say he was going 60 mph, had the wind on his tail, and the hwy sloped downhill a bit.
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Old 11-03-07, 07:41 AM   #35
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"well remember that the LS460 was rated at 27 hwy before the 2008 epa change. i solely believe that the old standard was achievable but you had to pay so much attention on the road and see when you did not need to brake before you could achieve it.

for instance, my RX is rated at 24 hwy and ive gotten 25 before (according to the avg mpg from the trip computer). i had just gotten a fill up and went directly onto the hwy for an hour trip and achieved 25. to me, getting 30 might be a little exagerated in this case, but its definately possible. say he was going 60 mph, had the wind on his tail, and the hwy sloped downhill a bit."

Both 27 mpg and 30 mpg averages were achieved on 1500 mile trips fom South Florida to PA, 99% interstate with cruise set between 75 & 80 mph depending on traffic conditions. MPG numbers were from trip computer backed up with a miles traveled divided by gallons used calculations. Less than 1/2 mpg variance. Only time car saw 60 mph was on way up to 75mph and coasting back down for interstate exits, and "flatlands" included the mountains of NC, VA MD, WV and PA on I-77 & I-81, and any tail winds were probably offset by headwinds at other times during the 22 hour trips. Please keep putting premium in your cars --Citgo/Hugo Chavez needs the money and Exxon /Mobil profits are waaay to low!!
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Old 11-03-07, 09:01 AM   #36
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very nice! now we just hope there are less traffic in CA!
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Old 09-24-08, 11:02 PM   #37
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Default Low Grade Gas in LS

Has anyone ever had to put low grade gas in their car? Here in Charlotte we are out of gas and I had to put some low grade gas in tonight. I never buy low grade gas but tonight I had no choice.

I had about a quarter of a tank of 93 in there.
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Old 09-24-08, 11:50 PM   #38
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one or two times won't hurt anything, the computer will retard the timing if necessary. if it were me, i'd just not drive aggressive. and once 91+ is available, put them back in
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Old 09-25-08, 08:56 AM   #39
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On my way back from Reno last week I had to fuel up in Oregon, a state where the attendant has to pump the gas and while I was inside using the rest room the kid mistakenly filled it with regular.

As suspected the compukor made the adjustment and I could tell no difference running through that tank.


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Old 09-25-08, 09:48 AM   #40
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On my way back from Reno last week I had to fuel up in Oregon, a state where the attendant has to pump the gas and while I was inside using the rest room the kid mistakenly filled it with regular.

As suspected the compukor made the adjustment and I could tell no difference running through that tank.


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I have to be careful of that in Mexico with my RX300 because gas stations are also full serve there and they assume everyone wants regular because of the cost.
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Old 09-25-08, 12:02 PM   #41
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I've done it on occasion on this car and many previous ones as well. Other than a little pinging (when the engine has a lot of miles on it) going uphill, the change in performance is hardly noticeable. As far as damage, you'd have to drive it real hard to affect the engine, and by the time you did - if you did, you'd have a lot of aggressive driving infractions to go along with it.
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Old 09-25-08, 12:59 PM   #42
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All the posts above are correct plus.....Your gas mileage will suffer. You will not hurt the car at all.

The knock sensor retards the timing and the performance suffers but in most cases you can't feel it. When the performance suffers you have to push in the pedal just a little harder (not noticeable) so you will get less gas mileage with low octane.

When you're about half full fill the tank with 93. Not to start any gas wars, use what you would like. It's just my observation that Shell V-Power 93 runs better in my car & motorcycles.
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Old 09-25-08, 01:23 PM   #43
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Thanks guys, I was worried I would damage the car. I had to do it!
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Old 09-25-08, 02:42 PM   #44
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At least you have gas, I am having to drive way out of the way to even find a station with gas!!! (Atlanta)

This totally sucks!!!
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Old 09-25-08, 04:58 PM   #45
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Wow, here in Missouri, we don't have any shortage of fuel...

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Old 09-25-08, 04:58 PM
 
 
 
 
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