Author Topic: Premium Fuel vs. Regular Fuel: The Debate!  (Read 20953 times)

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Offline Mike07ISS

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Re: Premium Fuel vs. Regular Fuel: The Debate!
« Reply #50 on: Jul 29, 2012, 07:46 PM »
I know that I should actually do the math and I have on previous vehicles before. I just can't remember the formula for converting miles to kms and litres to gallons. Any ideas?

Offline SidewaysLS4

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Premium Fuel vs. Regular Fuel: The Debate!
« Reply #51 on: Jul 29, 2012, 11:39 PM »
Google.


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Offline MorePower

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Re: Premium Fuel vs. Regular Fuel: The Debate!
« Reply #52 on: Dec 12, 2012, 04:55 PM »
I only run 91 without ethanol. I took two trips down to Utah from North Dakota one in 2011 and 2012 both in the summer. 2011 trip was the wife and I ran 80 most of the time and got 25.6 for the whole trip. One area I ran 110 mph for about 35 miles was in Montana and I got just under 24mpg this was in my 07MCSS.  2012 trip 5 people in my 96 ImpalaSS and ran 87 and got 23mpg mostly didn't keep all slips for gas for a more accurate reading. I also have made many trips to Minneapolis which I run 75 to 80mph in my 2007 Monte Carlo SS and get 25mpg because of to much ethanol in the gas down that way. You will get atleast 2to3 more mpg with premium this will more then make up the saving from running regular gas.

Offline 1sickGXP

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Re: Premium Fuel vs. Regular Fuel: The Debate!
« Reply #53 on: Dec 12, 2012, 08:09 PM »
Dont quote me but I work at a chevron station and the owner told me that the difference between 87 and 91 is they add there tecron blend powder into the gas and 89 is just a blend of the 91 and the 87 not sure if it is true or not. And another thing that the fuel truck driver said to me was (in cali) that they haul for a lot of stations one being the cheapest gas around price and quality. And when they fill they will often mix the gasses from the two companies. So I don't believe that there is that much difference but I still run 91 it ain't much more than 87.better to be safe then sorry

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« Last Edit: Dec 12, 2012, 08:11 PM by 1sickGXP »
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Offline 06mistreSS

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Re: Premium Fuel vs. Regular Fuel: The Debate!
« Reply #54 on: Mar 02, 2013, 01:14 PM »
I have run regular 87 octane in mine in the past but I now run premium 93 octane. I notice a small improvement in performance but fuel mileage is the same, although I am running a high performance air intake and exhaust system so the engine is pulling more air which means the system wants to throw more gas into the engine to keep the air/fuel ratio the same.
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Offline NorCal_GXP88

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Re: Premium Fuel vs. Regular Fuel: The Debate!
« Reply #55 on: Feb 06, 2014, 06:59 PM »
My old lady started pumping 87 at the pump, an got about 1/2 a gallon in my GXP before I noticed. the take was damn near empty.... should i just limp it around an burn the fuel out?
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Offline RON07GXP

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Re: Premium Fuel vs. Regular Fuel: The Debate!
« Reply #56 on: Feb 07, 2014, 02:38 PM »
This is an old thread to DEBATE REGULAR VS PREMIUM FUEL....If you do a little digging you'll find members who have had the same issue.

Only 1/2 gallon of regular is not going to make any difference. Just remember to fill up with premium only in the future or you'll have a lot of KR.
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Offline LS4 Racing

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Re: Premium Fuel vs. Regular Fuel: The Debate!
« Reply #57 on: Feb 07, 2014, 02:41 PM »
My old lady started pumping 87 at the pump, an got about 1/2 a gallon in my GXP before I noticed. the take was damn near empty.... should i just limp it around an burn the fuel out?

Just fill it up with premium.  It will dilute the 87 and you shouldn't have any problems.  A 1/2 gallon is basically nothing, anyway.
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Offline X Move (Tricky)

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Re: Premium Fuel vs. Regular Fuel: The Debate!
« Reply #58 on: Feb 12, 2014, 10:46 PM »
Lucas Injector Cleaner should help too. It has made several of my vehicles run much smoother.

It's certainly no sin if one must use 87. I was broke for a while so 87 is better than nothing. Some people are able to run 87 fine with no issues, but I am assuming they aren't really driven hard (no offense intended).
I'm not a mechanic, but there was definite lag while running on 87. I am assuming this is the ignition timing being retarded to prevent damage.

Eventually I made the switch to 93 octane. Although there will be no significant change in how the car drives, this is recommended by not just the manufacturer, but repair manuals as well. It took several weeks to for the system to really flush. Once it was fully running on 93, mileage was roughly the same however the acceleration lag was lessened and it idled smoother. This was while I was still running a stock ECU tune. It was almost like regaining lost power.

My advice is If you want to use your LS4 to its full potential use at least 93 octane.
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Offline LS4 Racing

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Re: Premium Fuel vs. Regular Fuel: The Debate!
« Reply #59 on: Feb 14, 2014, 12:47 PM »
Lucas Injector Cleaner should help too. It has made several of my vehicles run much smoother.

It's certainly no sin if one must use 87. I was broke for a while so 87 is better than nothing. Some people are able to run 87 fine with no issues, but I am assuming they aren't really driven hard (no offense intended).
I'm not a mechanic, but there was definite lag while running on 87. I am assuming this is the ignition timing being retarded to prevent damage.

Eventually I made the switch to 93 octane. Although there will be no significant change in how the car drives, this is recommended by not just the manufacturer, but repair manuals as well. It took several weeks to for the system to really flush. Once it was fully running on 93, mileage was roughly the same however the acceleration lag was lessened and it idled smoother. This was while I was still running a stock ECU tune. It was almost like regaining lost power.

My advice is If you want to use your LS4 to its full potential use at least 93 octane.

While I totally understand the need to pinch pennies in dire financial situations, the difference of $3.50 per fill-up between 87 and 91 is probably small enough to justify the benefit for most LS4 owners.  Of course, if that 3 bucks is the difference between feeding your family or not, then it's a no-brainer.

While the PCM will learn driving situations and conditions, it will only adapt so much to 87 octane fuel.  Having experimented with different fuels and tunes, along with constant monitoring of knock retard, I can tell you that 87 octane on a stock tune results in near-constant knock retard in virtually all RPM ranges.  Even with an 87-friendly tune, you'll still see 4+ degrees of KR all of the time.  Once could argue that the PCM is doing its job, but the reality is, there's still pre-ignition going on the in the engine, which is bad for head gaskets, piston rings, and even bearings.  And since timing is being pulled back, it has a negative effect on fuel economy, too.

The worst part is, even 91 octane is going to show a lot of KR on a stock tune, just not as much as 87.  And this is why I believe that every LS4 should have a decent tune, if only for the longevity of the engine.
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Offline REDZONE

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Re: Premium Fuel vs. Regular Fuel: The Debate!
« Reply #60 on: Jun 28, 2015, 05:39 PM »
What's the story with Shells new Nitro+ VPower?

I went to a shell station recently and filled up with Vpower and saw a sign that said nitro+ is new but my pump said Vpower...

Is all vpower now nitro+ or is it coming and going to be replacing vpower and they just have to change the stickers...

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Offline My325

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Re: Re: Premium Fuel vs. Regular Fuel: The Debate!
« Reply #61 on: Aug 08, 2015, 08:21 PM »
Lucas Injector Cleaner should help too. It has made several of my vehicles run much smoother.

It's certainly no sin if one must use 87. I was broke for a while so 87 is better than nothing. Some people are able to run 87 fine with no issues, but I am assuming they aren't really driven hard (no offense intended).
I'm not a mechanic, but there was definite lag while running on 87. I am assuming this is the ignition timing being retarded to prevent damage.

Eventually I made the switch to 93 octane. Although there will be no significant change in how the car drives, this is recommended by not just the manufacturer, but repair manuals as well. It took several weeks to for the system to really flush. Once it was fully running on 93, mileage was roughly the same however the acceleration lag was lessened and it idled smoother. This was while I was still running a stock ECU tune. It was almost like regaining lost power.

My advice is If you want to use your LS4 to its full potential use at least 93 octane.

While I totally understand the need to pinch pennies in dire financial situations, the difference of $3.50 per fill-up between 87 and 91 is probably small enough to justify the benefit for most LS4 owners.  Of course, if that 3 bucks is the difference between feeding your family or not, then it's a no-brainer.

While the PCM will learn driving situations and conditions, it will only adapt so much to 87 octane fuel.  Having experimented with different fuels and tunes, along with constant monitoring of knock retard, I can tell you that 87 octane on a stock tune results in near-constant knock retard in virtually all RPM ranges.  Even with an 87-friendly tune, you'll still see 4+ degrees of KR all of the time.  Once could argue that the PCM is doing its job, but the reality is, there's still pre-ignition going on the in the engine, which is bad for head gaskets, piston rings, and even bearings.  And since timing is being pulled back, it has a negative effect on fuel economy, too.

The worst part is, even 91 octane is going to show a lot of KR on a stock tune, just not as much as 87.  And this is why I believe that every LS4 should have a decent tune, if only for the longevity of the engine.

If the ECM is retarding timing more than 50% of the time on the 87 & 89 octane fuels you need more octane...

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