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Old 05-12-2011, 11:36 AM   #19
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Originally Posted by Bluevitz-rs View Post
I think you logic is a little flawed. What if I'm using 110 octane race gas? It's 110% less likely to pre-detonate?
No, It can be compressed 110% before it detonates by compression. 87 octane can be compressed only 87% before it detonates by compression.

Ethanol has less BTUs (energy) per gallon than gas so it's less efficient .

Here's a chart of energy values for different gas formulations: http://en.wikipedia.org/wiki/Gasoline_gallon_equivalent
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Old 05-12-2011, 05:48 PM   #20
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A molecule of gasoline is a molecule of gasoline. I don't even trust one major brand over another. The last big gasoline contamination event I can remember happened with Shell. In whatever car you drive, just use whatever the owner's manual says. If the engine doesn't ping, it's fine.
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Old 05-12-2011, 05:51 PM   #21
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I use the cheapest gas I can find.
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Old 05-12-2011, 06:00 PM   #22
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Here is a map of where you can get pure gas (no ethanol).


http://pure-gas.org/
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Old 05-12-2011, 06:09 PM   #23
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cheapest possible, if the car runs im good!..my brother in law pumps premium, but then again his mama pays for it hahaha
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Old 05-12-2011, 06:31 PM   #24
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Here is a map of where you can get pure gas (no ethanol). http://pure-gas.org/
I'd have to drive 135 miles. I don't think that would help my wallet.
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Old 05-12-2011, 07:46 PM   #25
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The engineers who designed the engine specify somewhere in the owners manual what type of fuel they designed the car to run on.
I'll follow their advice.
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Old 05-12-2011, 07:58 PM   #26
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I use the cheapest gas I can find.
Me too
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Old 05-12-2011, 08:05 PM   #27
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Originally Posted by Bluevitz-rs View Post
I think you logic is a little flawed. What if I'm using 110 octane race gas? It's 110% less likely to pre-detonate?
yes that's it.
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Old 05-14-2011, 10:09 AM   #28
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Shell gas any good? I heard chevrons techron runs well, I'm one of those people who think premium is best no matter what lol.

Have you noticed the wrx will burn quality fuel quicker than ethanol fuel aswell?
All of our premium here is 10% ethanol so its the all the same. There is ONE sation I can by non-mixed prem from, but its a ton of money (like $.25 more per gallon)
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Old 05-14-2011, 11:18 AM   #29
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i mix all three to get the whole spectrum
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Old 05-14-2011, 01:31 PM   #30
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on the topic of fuel.. do fuel system cleaners (the kind you dump into your tank) help at all? I didn't want to search it myself because I'd get a lot of unprofessional answers and bad opinions elsewhere.
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Old 05-14-2011, 02:10 PM   #31
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I avoid old worn down gas stations with dirt and mud all over their pumps. Also, if I know a gas station has a gross restroom, I pass it for the pretty restrooms.
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Old 05-14-2011, 02:44 PM   #32
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i mix all three to get the whole spectrum
lol, love it.
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Old 05-14-2011, 04:36 PM   #33
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Originally Posted by Bluevitz-rs View Post
I think you logic is a little flawed. What if I'm using 110 octane race gas? It's 110% less likely to pre-detonate?
LOL.. i was thinking the same thing
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Old 05-14-2011, 06:59 PM   #34
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91 since im supercharged....but usually canadian tire for the CT money on my mastercard...
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Old 05-14-2011, 07:41 PM   #35
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i used to do premium all the time but been filling up with regular for the past 2 months no problems and no difference really, i think im getting 20 miles more a fill up it feels like, i usually get to the last bar at around 320 miles total on a full tank with the regular i been getting around 340-350 until it hits the last bar on a full tank of regular, plus these prices are expensive now so premium was no good for me no more.
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Old 05-15-2011, 10:54 PM   #36
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Quote:
Originally Posted by Happy Little Pony View Post
A molecule of gasoline is a molecule of gasoline. I don't even trust one major brand over another. The last big gasoline contamination event I can remember happened with Shell. In whatever car you drive, just use whatever the owner's manual says. If the engine doesn't ping, it's fine.
Quote:
Originally Posted by ilikerice View Post
LOL.. i was thinking the same thing
lol the numbers are wrong, but the idea is correct.

The higher the octane the harder the fuel is to combust. The measurements are silly complicated and there are two scales, but that is the basic jist.

And while they say putting in higher octane gas on normal cars don't do anything, it is interesting to note all cars and manufacturers use 93 octane on the tests to get the numbers. Of course whether or not the difference is worth it is up to you. I don't think it is.
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