Whats gas does your car like best - Chevy Impala SS Forum
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post #1 of 49 (permalink) Old 11-18-2016, 06:31 PM Thread Starter
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Whats gas does your car like best

What gas brand does your B/D body run best on?. Some of you may already know most gas stations get gas from the same storage terminals including unbranded stations, but each brand gets
it's own additive/detergent package before being delivered to station. With that being said my Roadmaster likes exxonmobil/valero/shell the best. One shell station in particular my car is as happy as a pig in **** when I fill it up there.
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post #2 of 49 (permalink) Old 11-19-2016, 07:06 AM
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Mine does not seem to notice any difference. The additives for each brand are different for each brand, but must meet minimum federal standards. Some stations may use a generic gas, but the brand name stations have their own blend. The detergents are probably the difference.


Using premium in a car that only needs regular is a waste of money. The car does not know the difference, unless it is a lower octane rating than advertised on the pump, and you are pumping the required minimum octane rating for the car.


Should you get a lower octane rated gas, the car will have a tendency to "knock", and that will cause the timing to retard, consequently causing lower performance.

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post #3 of 49 (permalink) Old 11-19-2016, 08:39 AM
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Sunoco for me... and also...LT1s are a high compression motor and require premium for optimal performance as well as the longevity of the motor. Its how they were designed.

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post #4 of 49 (permalink) Old 11-19-2016, 09:23 AM
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Originally Posted by popo8 View Post
Sunoco for me... and also...LT1s are a high compression motor and require premium for optimal performance as well as the longevity of the motor. Its how they were designed.

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I don't think i agree with the "they need Super" comment.
Especially a B/D body, you must be talkin F and Y body.

I have been going to Citgo , the CEL seems to turn off more when i go there.
supermarket gas station is the worse around here...YMMV.

-ALF out..

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post #5 of 49 (permalink) Old 11-19-2016, 11:10 AM
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I don't think i agree with the "they need Super" comment.
Especially a B/D body, you must be talkin F and Y body.

I have been going to Citgo , the CEL seems to turn off more when i go there.
supermarket gas station is the worse around here...YMMV.

-ALF out..
You dont have to agree... fact is... as you add compression you must add octane.

Ur SEL light shouldnt ever be on... so thats not really a great point to make.

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post #6 of 49 (permalink) Old 11-19-2016, 11:19 AM
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Sunoco for me... and also...LT1s are a high compression motor and require premium for optimal performance as well as the longevity of the motor. Its how they were designed.
The B-Body LT1 was designed to run on 87. A stock one doesn't need or benefit from premium.

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post #7 of 49 (permalink) Old 11-19-2016, 11:21 AM
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Quote:
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Sunoco for me... and also...LT1s are a high compression motor and require premium for optimal performance as well as the longevity of the motor. Its how they were designed.
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You dont have to agree... fact is... as you add compression you must add octane.
The iron head LT1 does not need more than 87 octane fuel on the stock tune. If you can find a good ethanol free 87 Oct fuel in your area, go for it.

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post #8 of 49 (permalink) Old 11-19-2016, 11:58 AM
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The iron head LT1 does not need more than 87 octane fuel on the stock tune. If you can find a good ethanol free 87 Oct fuel in your area, go for it.
Jason is correct. The fact that you think otherwise simply means you are ignorant of the purpose of the LT-1's reverse flow cooling system. That was the whole idea, to allow both high compression and low octane. You also don't seem to grasp that the PCM can be tuned for higher octane if you desire to run it and there is some mild performance gain in doing so. As far as gasolines go, the important thing is to use a Tier 1 brand and that is not necessarily only the expensive ones. ARCO here is Tier 1 and Valero may now be also. I have always run a tank of Chevron with Techron through the system every couple of months as the Techron will keep your injectors clean. Hopefully you will have learned something here. The high compression needs high octane argument does not apply to these engines and there is no point in arguing to the contrary.
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post #9 of 49 (permalink) Old 11-19-2016, 12:07 PM
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I've wondered about this. I figured cop cars (9c1) are made to run on 87 & glorified cop cars (impalass) run on premium.




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post #10 of 49 (permalink) Old 11-19-2016, 12:49 PM
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There is no difference in the drive train of a LT-1 9C1 and an ImpalaSS.

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'95 9c1, pcmperformance.com 93 tune, Dynomax Ultraflo catback, K & N box filter, LT4 KM, 160 stat, 3.08 Posi.
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