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 Post subject: Octane
PostPosted: Thu Aug 24, 2017 2:49 am 
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Joined: Mon Sep 12, 2016 5:18 am
Posts: 139
Location: Delmarva
Ive seen from multiple sources that these cars (L77) are rated for 87 or above octane. My car has just over 20k miles on it now and since day one Ive used 87, havent had any issues and my fuel mileage averages about 22mpg 90% highway @70-75mph.

I read in the owners manual the other day and it stated, vehicles with the V8 engine are supposed to use 91 or above octane. So the last tank I kissed my wallet and decided to throw in a tank of 93....

OMG what a difference, very noticeable change and it took about 1/2 tank for the ECM to adjust itself. Fuel mileage went up about 30-45 miles on a tank, and that is with very spirited driving.

On a normal fill up, the onboard display would read between 385-400 miles to empty, now, with 93, it would read 420-430 miles to empty. Next thing I need to do is drive like I used to and see what fuel mileage I attain.

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"God created Police Officers so Fireman could have heroes!" - My late Father

2014 Phatom Black 9C1 (Toy)
2000 VW Jetta TDI (Daily 420k miles)


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 Post subject: Re: Octane
PostPosted: Thu Aug 24, 2017 3:14 am 
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Joined: Sat Apr 29, 2017 4:47 pm
Posts: 36
One - I can't fathom 30-45 mpg in any sort of driving. I don't want to call BS but... BS.
Two - Are you sure these performance gains are as dramatic as you are making them sound?

I want to believe - don't get me wrong - but I doubt youre the first one to use 93 octane in our cars. And I know from my experience with other cars that 93 doesn't seem to make a difference unless the tune was different for the change.

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2011 9c1

"It's got a cop motor, a 364-cubic-inch plant. It's got cop tires, cop suspension, cop shocks..."


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 Post subject: Re: Octane
PostPosted: Thu Aug 24, 2017 3:40 am 
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Joined: Mon Jul 29, 2013 6:44 am
Posts: 1044
Location: Azusa,CA
30-45 miles more on a tank, Not 35-45 MPG.

Huh, 11 owners manual does not mention anything about it but 14 does, interesting:

Image

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Steve Walker
Azusa, CA
'11 PPV 9C3 Huron White


Last edited by smwalker on Thu Aug 24, 2017 3:50 am, edited 1 time in total.

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 Post subject: Re: Octane
PostPosted: Thu Aug 24, 2017 3:50 am 
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Joined: Sat Apr 29, 2017 4:47 pm
Posts: 36
Ahhhh I apologize!

I thought you were going nuts, but it turned out it was me being the nut!

:roll: :shock:

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2011 9c1

"It's got a cop motor, a 364-cubic-inch plant. It's got cop tires, cop suspension, cop shocks..."


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 Post subject: Re: Octane
PostPosted: Thu Aug 24, 2017 4:45 am 
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Joined: Mon May 30, 2016 8:12 am
Posts: 178
Location: phx az
the L76(G8 non-flex fuel) and L77(ppv flex fuel) are both 10.4-1 motors

in most theory's we should use 91 , but alot depends how you drive , i drive mostly in traffic and rarely put my foot in it , so ive used nothing but 87


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 Post subject: Re: Octane
PostPosted: Thu Aug 24, 2017 5:53 am 
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Joined: Mon Sep 12, 2016 5:18 am
Posts: 139
Location: Delmarva
Hahaha 45mpg, in this car, I wish.
Thats why my "daily" is a TDI Jetta, thats my 50mpg car.

But yea, I never had an issue running 87, like I said, 20k miles worth of it. But it was a noticeable difference switching fuels. Now, cost effectiveness...thats a different story. It would normally cost me 39-42$ to fill up 87. With 93, 48-50$ a tank full.

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"God created Police Officers so Fireman could have heroes!" - My late Father

2014 Phatom Black 9C1 (Toy)
2000 VW Jetta TDI (Daily 420k miles)


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 Post subject: Re: Octane
PostPosted: Thu Aug 24, 2017 6:16 am 
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Joined: Mon May 30, 2016 8:12 am
Posts: 178
Location: phx az
that along with bumper to bumper i just use 87 , ill be glad when the weather cools enough to use my 96 sunfire more , i get 3 weeks to a tank in it and less than half that in the ppv , but the ppv is alot more comfy compared to a lowered 170k beater , lol


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 Post subject: Re: Octane
PostPosted: Thu Aug 24, 2017 6:57 am 
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Joined: Mon Sep 12, 2016 5:18 am
Posts: 139
Location: Delmarva
with my commute, its 3 days @ 30$ for the tdi or two days @$40 in the chevy. But the chevy has AC, the Jetta currently doesnt.


BUT, what I will do, just to make sure I am not going crazy, is measure 0-60 times with 87 and 93 and compare. Give me a week and Ill produce some numbers.

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"God created Police Officers so Fireman could have heroes!" - My late Father

2014 Phatom Black 9C1 (Toy)
2000 VW Jetta TDI (Daily 420k miles)


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 Post subject: Re: Octane
PostPosted: Fri Aug 25, 2017 12:34 am 
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Joined: Fri Aug 12, 2016 12:13 pm
Posts: 185
Location: Tampa, FL
The stock tune Lo Octane spark table have as much as 12 degrees of timing retard compared to the Hi Octane table in the mid throttle areas. On LS engines this area usually corresponds to the peak torque, so what you feel is not imaginary.

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2014 Chevrolet Caprice PPV
2014 Chevrolet Stingray Z51
2016 Cadillac ATS-V
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 Post subject: Re: Octane
PostPosted: Fri Aug 25, 2017 2:05 am 
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Joined: Mon Sep 12, 2016 5:18 am
Posts: 139
Location: Delmarva
Thats good to know!

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"God created Police Officers so Fireman could have heroes!" - My late Father

2014 Phatom Black 9C1 (Toy)
2000 VW Jetta TDI (Daily 420k miles)


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