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Discussion Starter · #1 ·
I am staying n/a - just a cai,1.8lcam,and 421 header.
Is there any REAL benefit to paying for super unleaded vs mid vs cheap?

I got used to using super unleaded when I had really hp v8's as a kid because of ping.

Just curious if I'm throwing away money.

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me and my brother use only super unleaded aswell because of his first car(V8) muscle car.
thats a good question, are we throwing away our money?!?!?


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I don't see it as much with my accent but i know with my nissan with a 2.4ltre it got better gas milage off higher octane. My accent seems to have more peep with Mid... I know C&D did a dyno/0-60runs with low and super.. it seemed to vary from car to car. The one that showed the most dislike for cheap stuff was a Saab Turbo and the one that cared the least was a Dodge v8.


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Its octane guys, the more, the better! and the better your motor will sound, no ping ping ping. I put 92 octance in mine, been doing it ever since I got the car. It runs nicer, and quicker, works good with smaller motors too, for instance my brothers GO PED! He put some 92 octane in that thing and it was whuuping some ass. I'd say its worth it. Its what 115-130 a gallon over here so go for it.


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than i shall keep on using it, never used anything less ever same with my bro..


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If your engine isn't designed for premium gas <b>you are wasting your money</b>. The only thing that high octane gas does is prevent detonation. Since you aren't running high compression this shouldn't be an issue.

I also read the article in C&D. The cars made for regular gas (ie Honda Accord) had no signifigant change in dyno readings or 1/4 mile times.


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waste of cash without higher compression or a better ecu, enless your pinging on the cheap stuff.

My 2001 accent GS hate 93 octance, loves 89, and lives with 87.


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What it is, octane is a molecule that burns slower than the other molecular forms of gasoline. All you are concerned about is making sure the flame front spreads through the combustion chamber in an orderly fashion. The higher the compression, the faster the flame front will move, and the higher the heat is, resulting in increasing chances of a 'hot spot' causing the mix to explode way ahead of time instead of burning. Very bad for the engine. So if you have high compression, whether by intent or because you've let too much carbon build up in your combustion chamber, run gas with higher octane. The only other reason to get picky with gas is to make sure it has good detergents to keep your injectors clean; there was a good Consumer Reports article on that a few years ago. BTW, today's "premium" wouldn't have done it for anyone back when guys would drive out to the airport for avgas or at least run the real Chevron Custom Supreme. But truly high octane isn't needed now because intake design has improved so much.
 

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Discussion Starter · #9 ·
I think I'll go with mid as it isn't much more and at least it isn't super cheap. I use chevron most of the time which I heard is good because of the detergents.
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I would suggest you do your own testing. Run normal gas for 5 tankfulls and record your mileage. Then do the same for "mid" grade, then for "premiujm". Then average out the cost of the gas vs the mileage you get, and you should get a good idea as to if it is worth it or not.

In general, our Beta engines were NOT designed for higher octane fuel, and thusly you should NOT see any increase in performance or mileage using the higher octane gas. However, if your engine has carbon buildup, and/or dirty fuel injectors, the higher octane gas also usually has a higher percentage of detergents. This should help clean the carbon out, and help clean out the fuel injectors.

In my personal opinion, use normal gas, and at every oil change or so, slap in a bottle of fuel injector cleaner (pick your favorite brand), and you should be fine.


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I just read an article in a mag that said that if you are using high octane fuel and your car doesn't require it, you may be damaging the engine. I dont know if this is true or not.
By the way, gas here is $1.06 a gallon, how much is it were you're at?


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i tried the test, the best gas gives me the best mileage. thats the only diffrence i see and that is why i'll stick with the expensive stuff since it only cost 2 cents extra per gallon and gives me 3-4 mpg more<img src=/images/forums/snitz/thumbup.gif width=25 height=18 border=0>


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what i read is that higher octane leaves more carbon deposits and you should follow what octane is reccomended by the manufacturer

i think a lot of companies purposely design the engine to run on lower octane to save you money
unless your car is turboed, i wouldnt bother


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