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Fuel type?

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Old Mar 23, 2017 | 04:34 PM
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Default Fuel type?

Ok so my area primarily only has 91 octane fuel, do I have to add any additives to the fuel or is it ok ? Car is a 2010 grandsport stock
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Old Mar 23, 2017 | 04:41 PM
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No, it's okay.

2010 owner's manual, page 6-7.

If the vehicle has the 6.2L V8 engine (VIN Code W), use
premium unleaded gasoline with a posted octane rating
of 91 or higher.

If the vehicle has the 6.2L V8 engine (VIN Code T)
or the 7.0L V8 engine (VIN Code E), use premium
unleaded gasoline with a posted octane rating of 91
or higher.

If heavy knocking is heard when
using gasoline rated at 91 octane or higher, the engine
needs service.

Last edited by Vette_DD; Mar 23, 2017 at 04:41 PM.
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Old Mar 23, 2017 | 04:42 PM
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Thank you very much ! I'm going to download the service manual so I can read up!
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Old Mar 23, 2017 | 04:49 PM
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No need to add additives. All we have around here is 91 as well; when on road trips, I use 93 when available.

Here's a link to the Owner's Manual for your year: http://www.c6registry.com/technical/...upe_owners.pdf

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Old Mar 23, 2017 | 05:40 PM
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Originally Posted by Welker1
No need to add additives. All we have around here is 91 as well; when on road trips, I use 93 when available.

Here's a link to the Owner's Manual for your year: http://www.c6registry.com/technical/...upe_owners.pdf

We have an adequate supply of 93 here in the northeast
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Old Mar 23, 2017 | 07:05 PM
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Modern cars will just pull timing if they detect knock from lower grade gas. Heck, they probably have separate fuel tables for 87, the ls2 did so I can't imagine the ls3 doesn't.
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Old Mar 23, 2017 | 08:53 PM
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91 octane is all that we have around here too. It's fine, no problem.
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Old Mar 23, 2017 | 09:21 PM
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The one thing you have working for you, is that 91 octane is a minimum of 91 octane, which is randomly tested by weights and measures to be accurate.

Most fuel stations have 2 tanks. One holds 87 octane fuel (as low as 85 in the rockies) and the high octane tank holds 93/94 depending on where you are.

What's this mean for the consumer buying 89, 90, 91, and 92 octane fuel at the pump? It means that the higher octane requirement you call for when making your selection, the more of the higher octane fuel you get. In reality, machines are good but nothing is 100% accurate. You could be getting 92
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