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Old 01-15-2018, 01:11 PM   #15
Need4Camaro
 
Drives: '17 Camaro 2SS & '99 Camaro Z28
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Quote:
Originally Posted by Doug kj6aco View Post
I always run 91 for 2 reasons, 1 to get better mileage and 2 for temperature.
I would not put 87 in my lawnmower.
At over $3.00 a gal. in So. California 10 cents is a low percentage and with getting more mpg it's a no brainer for me.
This is an average and every time I get on the freeway I have fun, If I take it easy I read 24 mpg average.
That's actually kind of low. I average 27 MPG 100% street not even trying to save gas and that's 100% 87 octane.

Here though it's different than SoCal. The price difference in 87 and 93 is about $0.50 to $0.75 difference.. and my wallet feels it too.

Only way I'm using premium regularly is if I get an SS
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Old 02-27-2018, 02:59 PM   #16
Benb
 
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I've put on 44k miles on mine (still even the original tires!) so far from my experience, my car has been reliable on all blends. The car has had its mix of 87 to 93. My basic rule of thumb...Daily driving/road trips 87, spirited..93
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Old 02-28-2018, 01:13 PM   #17
Camarolover85

 
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What’s 93? Never heard of it.
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Old 02-28-2018, 07:44 PM   #18
Benb
 
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Originally Posted by Camarolover85 View Post
What’s 93? Never heard of it.
Chicago has 87/89/93 split at the pumps. There's some weird 15+ that's out there too now.
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Old 03-19-2018, 06:28 AM   #19
mdhopt36
 
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+1.
Practically every vehicle I've driven past 15-20 years with alcohol in it, engine runs better, tranny shifts less, mileage increased. But money wise it works out about a wash. I had an early model Tundra PU, and one winter it would hardly start after a steady diet of below top tier 87 gas. One tank of premium 91 shell cured that; almost immediately
Just my 2 micrograms, ymmv.
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Old 03-19-2018, 06:31 AM   #20
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Oh, and I had the opportunity to get some 91 sans the alcohol, but a brand I couldn't identify. No difference in the car/truck, but wonders with leaned-out chainsaws/boat/lawnmowers. These definitely don't like to burn booze mixtures!
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Old 03-19-2018, 08:07 PM   #21
cellsafemode

 
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Premium only. premium in my v8 92 camaro, premium in my 2001 z28 camaro, and premium in my 2016 v6 camaro.

My reasons are :

1. I dont commute 2 hours every single day
2. The difference in price is a small lunch every two weeks.
3. More advanced timing is always worth it

Plus, i'm sure in the icy cold (used to live in the north east) the fuel attracts more than it's fair share of water and i'd rather it dilute 93/91 octane than 87.
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Old 03-20-2018, 01:42 PM   #22
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I have been running 91 in my car for 4-5 tanks now. I have never used premium in any of my cars and did this just as a "let's see what happens". The only difference I have noticed is engine noise. To me, it's quite evident. Far less pinging during hard acceleration. Other than that, nothing else seems to have changed. No better performance or mpg.
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Old 03-21-2018, 07:41 AM   #23
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The knock sensor will detect pinging quiet enough that you can't hear. So the fact you get audible pinging means the car has been pulling timing for a while. It takes quite a few drive cycles for the PCM to add timing back and give you more power. How much power just depends on how aggressive the factory tune is, but it may not be butt dyno noticeable.
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