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Engine & Internal Chat about beefing up your engine's insides here.

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Old 07-17-2008, 05:58 PM
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Default plus gas

i tried to search it but seeing how half of haf is down its a lil hard, simple enough question is putting chevron plus "the middle grade gas" in my car bad? some dude at work said i was killing my car.
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Old 07-17-2008, 08:21 PM
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Default RE: plus gas

Uhhh....tell that guy to go soak his head. Technically, you are treating your car since it is designed for 87 octane. mid-class is 89 i believe.
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Old 07-18-2008, 07:37 AM
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Default RE: plus gas

yeah, I agree...
Just to add on the octane topic, if your car is stock, 93 octane will be a waste of $$$. your car is designed to work w/ 87/89...so that said... mmmmmm.... im done writing now...
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Old 07-18-2008, 08:47 AM
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Default RE: plus gas

Your car was designed to run on 87. 89 may not hurt it, but it is a big waste of $ since it does not help anything. You will actually get worse gas mileage too.
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Old 07-18-2008, 10:52 AM
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Default RE: plus gas

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ORIGINAL: 00AccordLX5spd

... You will actually get worse gas mileage too.
Very tiny difference in my experience. Still a waste of money.
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Old 07-18-2008, 11:33 AM
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Default RE: plus gas

^ yeah I know. One thing that has been making me mad about gas recently: almost every gas station I have gone to has a sign on the pump that says "Contains 10% Ethanol". That means I will get worse gas mileage correct?
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Old 07-18-2008, 12:49 PM
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Default RE: plus gas

Correct-o-mundo. "/
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Old 07-18-2008, 12:56 PM
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Default RE: plus gas

Energy content (LHV for the geeks)

Iso-octane = 110k BTU/gallon
Ethanol = 76k BTU/gallon

A 90/10 mixture should be about 106k or 107k, so thats about 3% worse.
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Old 07-18-2008, 02:07 PM
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Default RE: plus gas

HAF is pissing me off... octane means nothing about performance, but rather anti-knocking...
read this: http://www.howstuffworks.com/question90.htm
and: http://en.wikipedia.org/wiki/Octane_rating
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Old 07-21-2008, 11:31 AM
 
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Default RE: plus gas

just to add on this ...(BTW i did not read the link) ... Its funny for some1 to mention this knocking issue .... when I had my M3 (imported high performance model) i had this chick fill me up on fuel for some $$$ she owed and the biatch put 87-octane ...
the car started knocking.....? I know it was because of that...If I remember correctlythe M3 i had required a minimum of probably the 93 but was designed to run best on even higher? (i think octane rating might be higher in Europe?)
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