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For those people/women who have never noticed them, I'm talking about gasoline octane ratings aka regular/premium

I've always used 87 because it's cheaper, but just today I discovered my car's actually designed to run most efficiently on fuel with 91 or higher octane rating. I've had premium in it before and it accelerates noticeably faster so now I must test if the mileage is actually better   philip;

i think it is. i put 15$ worth of super in it friday and i'm still good for a few more days, with considerable travel for that amount. it does run smoother and accelerates faster, but it does make a difference in monies. usually i put just regular unleaded in it (given my car is an old POS that i plan on running to death since it costs me next to nothing) unless i'm in a peculiar mood.

Quote from: Socks on May 23, 2010, 09:50:26 PM
i think it is. i put 15$ worth of super in it friday and i'm still good for a few more days, with considerable travel for that amount. it does run smoother and accelerates faster, but it does make a difference in monies. usually i put just regular unleaded in it (given my car is an old POS that i plan on running to death since it costs me next to nothing) unless i'm in a peculiar mood.

my question is how am I supposed to get 91, I've never seen pumps with something besides 87/89/93/diesel

wat
i always go for the cheapest one. i don't really care.

Quote from: wziard on May 23, 2010, 09:59:38 PM
my question is how am I supposed to get 91, I've never seen pumps with something besides 87/89/93/diesel

i think it's the same here. go for the 93. otherwise get creative and do half 89 half 93; as a bonus they'll think you're insane.

so i waited for the oil light and purchased 2.5 gallons of rated 93. two days later and 75 miles down the road, that fuel is almost gone. the ratio works out to a beautiful 30 miles per gallon, which is fucking phenomenal for my POS car. i have to try the same with regular unleaded to see if i can discredit the findings, as some are of the opinion this is a fools belief (that richer octane gas increases fuel efficiency).

Quote from: Socks on May 28, 2010, 07:50:05 AM
so i waited for the oil light and purchased 2.5 gallons of rated 93. two days later and 75 miles down the road, that fuel is almost gone. the ratio works out to a beautiful 30 miles per gallon, which is fucking phenomenal for my POS car. i have to try the same with regular unleaded to see if i can discredit the findings, as some are of the opinion this is a fools belief (that richer octane gas increases fuel efficiency).

I was reading some reports of the same experiment in my car and most people found the average miles per gallon for both types to be extremely close. The extra power with premium is definitely a plus, though, so I'll keep using it

Unless you have a high end car then premium fuel doesn't do shit.

With a higher end car (thus better engine) the timing needs the correct fuel to air ratio.


If you car runs without kickbacks with regular fuel, you most like aren't going to benefit from premium fuel. If your engine's compression capabilities aren't high enough you are wasting money because it isn't burning all of the fuel.

It might be a little higher than needed for regular fuel, which is why you think you are seeing a slightly better mpg, but the cost of wasted fuel is almost certainly outweighing the small benefit.


I don't know a lot about cars but from an engineering/physics standpoint I can understand the dynamics of a piston engine/internal combusting engine.

I've always put in 87. I always heard not to use the higher stuff unless your car is made for it.

Quote from: Khadafi on May 28, 2010, 08:05:52 PM
Unless you have a high end car then premium fuel doesn't do shit.

With a higher end car (thus better engine) the timing needs the correct fuel to air ratio.


If you car runs without kickbacks with regular fuel, you most like aren't going to benefit from premium fuel. If your engine's compression capabilities aren't high enough you are wasting money because it isn't burning all of the fuel.

It might be a little higher than needed for regular fuel, which is why you think you are seeing a slightly better mpg, but the cost of wasted fuel is almost certainly outweighing the small benefit.


I don't know a lot about cars but from an engineering/physics standpoint I can understand the dynamics of a piston engine/internal combusting engine.

Well if it's the same miles per gallon for each type then there's no reason not to go higher, it's much better fuel.

Also I think my engine was knocking before, I thought it might have been transmission trouble or a cylinder snag or something, but could it be CARBON BUILDUP???

Here, 89 is actually the cheapest fuel to get. befuddlement