[StarkIndustries]

any guesses on this. Will it require 91 or higher?

I know 2015 required premium gas if I recall correctly.

[mt3130]

I would imagine 91 or higher is recommended.

[DGthe3]

Originally Posted by StarkIndustries

any guesses on this. Will it require 91 or higher?

I know 2015 required premium gas if I recall correctly.

For the 2015 SS (with either the LS3 or L99 engine) premium was recommended, not required. It appears to be the same thing with the LT1, at least in the Corvette though I doubt it would be any different in the Camaro. That said, for the 5th gen output was substantially reduced if you ever ran it on regular. I have no idea how the LT1 responds to regular fuel.

[SSport16]

Originally Posted by StarkIndustries

any guesses on this. Will it require 91 or higher?

I know 2015 required premium gas if I recall correctly.

91 is going to be recommended, it will run on 87, it has knock sensors, but it will drastically reduce power like said above. I wouldn't even think of putting in anything other than premium, just doesn't make sense.

[lDejavul]

My nearest gas station has two options either e10 up to 91 octane or 87 octane 100% gas. Should I drive the extra 15 miles to get 100% gas at 91 octane. Will the E10 make a huge difference?

[Zultain7]

The way that I see it is unless I'm taking it to the track, I'll be putting in 87 or 89 octane. I know 91 will be recommended, however, with the amount of time im sitting in traffic I don't need the higher end stuff.

[bdavies11]

Other than reduced power, are there any other reasons not to use premium fuel? Would long term use of 87 octane be bad for the lt1?

[VF-22]

Originally Posted by SSport16

91 is going to be recommended, it will run on 87, it has knock sensors, but it will drastically reduce power like said above. I wouldn't even think of putting in anything other than premium, just doesn't make sense.

If the engine is designed to run on 87, then that's all you need. With today's engines/sensors there is no point to run a higher fuel unless the engine requires it or you are tracking it. Engines like Audi's require premium because they are designed for it.

The power reduction will not be noticeable to 99% of the drivers in the V8 or V6. The Turbo is the one that WILL notice it.

The Mustang engines are designed to run on 87 (all 3 trims) via their user manuals, but the EB is the one that is affected the most by running 87 due to it's HP going from 310 to about 279 vs Premium. That's why they advertise with the * for the EB.

As for the GT, it also gets an * but it takes a 1% HP hit running 87 so the 435HP is dropped to about 430HP which no one is going to notice unless they are tracking it.

Now if the LT1 is designed baseline to run on 91 or 93, then you NEED to put that in it.

So in reality, if it's not designed to run on 91 or 93, it just doesn't make sense to run 91 or 93 for the majority of buyers. Wasting big time $$$.

Fuels today if they are Top Tier are not going to damage your engine at all if you run 87.

www.toptiergas.com

[NASTY99Z28]

Originally Posted by bdavies11

Other than reduced power, are there any other reasons not to use premium fuel? Would long term use of 87 octane be bad for the lt1?

Yes if its under a load and even with timing being pulled it can still have detonation. Prolonged detonation could cause spikes and burn up a piston or melt the head. It would take a pretty wreckless driver to do it but its possible.

[GretchenGotGrowl]

I would run the recommended octane, the LT1 in the Corvette uses the newer knock sensors and they are very sensitive. You can probably get by with 87 octane, but why risk it if GM recommends something higher?

[laborsmith]

Originally Posted by VF-22

If the engine is designed to run on 87, then that's all you need. With today's engines/sensors there is no point to run a higher fuel unless the engine requires it or you are tracking it. Engines like Audi's require premium because they are designed for it.

The power reduction will not be noticeable to 99% of the drivers in the V8 or V6. The Turbo is the one that WILL notice it.

The Mustang engines are designed to run on 87 (all 3 trims) via their user manuals, but the EB is the one that is affected the most by running 87 due to it's HP going from 310 to about 279 vs Premium. That's why they advertise with the * for the EB.

As for the GT, it also gets an * but it takes a 1% HP hit running 87 so the 435HP is dropped to about 430HP which no one is going to notice unless they are tracking it.

So in reality, it just doesn't make sense to run 91 or 93 for the majority of buyers. Wasting big time $$$.

Fuels today if they are Top Tier are not going to damage your engine at all if you run 87.

www.toptiergas.com

I am going to disagree with this conclusion because the ecu needs to perceive knock to change table that means every time one desires to start the engine and drive away there will be a series of the knock sensor changing fuel maps one step at a time until no knock is picked up.

At least that is my perception of how it works but if I am wrong I am certain one of our member engineers will set me straight.

Laborsmith

[SSport16]

Originally Posted by GretchenGotGrowl

I would run the recommended octane, the LT1 in the Corvette uses the newer knock sensors and they are very sensitive. You can probably get by with 87 octane, but why risk it if GM recommends something higher?

I agree, why risk it for a few dollars more every fill up. For me it will probably come out to $200 more/year! The engine CAN run on 87, but ideally it is recommended for 91 or higher. With electronics/sensors/ECM's being a huge part now a days in cars, especially cars like the Camaro and Vette, why risk it for a few dollars more? Just my 2 cents worth.

[GretchenGotGrowl]

Originally Posted by SSport16

I agree, why risk it for a few dollars more every fill up. For me it will probably come out to $200 more/year! The engine CAN run on 87, but ideally it is recommended for 91 or higher. With electronics/sensors/ECM's being a huge part now a days in cars, especially cars like the Camaro and Vette, why risk it for a few dollars more? Just my 2 cents worth.

Not to mention, if there is a failure that can be tracked back to not following manufacturer recommendations, then you might find it not covered under warranty.

[BahamaTodd]

Originally Posted by lDejavul

My nearest gas station has two options either e10 up to 91 octane or 87 octane 100% gas. Should I drive the extra 15 miles to get 100% gas at 91 octane. Will the E10 make a huge difference?

Only difference you will see between E10 and E0 would be a slight difference in fuel mileage. If the E0 is much more expensive or much more out of your way, its not worth it.