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i have a 2k3 ex coupe with 20,000 miles. over the past 2-3 weeks i have been experiencing an amazing increase in gas mileage. before this, i used to fill up a full tank of 93 gas every friday night and by sunday, half would be gone so i would put another 10 bucks in on tues or weds. recently, i put in DIY ram air intake with a k&n drop in filter and started filling up on 87 gas for the first time in my car's life. now, the gas needle does not move! the full tank lasts me over a week with a day or so left! wtf is going on? i am driving the same amount and i drive very very hard. what can be the reason for this awesome increase in mpg?

 
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87 is easier to burn than 93 ...

 
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Im sorry, but measuring the gas mileage by the day (full tank lasts me over a week with a day or so left) is not the proper way of doing it. Try again.

I thought someone has posted the proper way of getting the mpg?

 
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It has been posted. Could be that you are using the right gas now. You shouldnt have been using 93. I used to use 89/93, but I use 87 now, and 89 once and a while. I notice that the higher octance goes faster on my car too, so I dont waste my money, cuz its not doing any good anyways

 
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Actually, contrary to what you may have heard, I believe that the higher the octane, the easier it is to burn. Simply because it is a purer gasoline, therefore sparks quicker and burns more completely than a lower octane count gasoline. This is the way I was explained it. Can someone clarify?

 
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mines been going up too.. i think its because of the cooler weather, no AC!!

 
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i use 87 and i get great mileage compared to 93

silversleeper i agree what you say, dats what i have been told also

 
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Only use the specified Octane for your cars, or youll get screwed, and there is NO extra benefit to higher octance regardless of what you have been told.

 
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Higher octane is harder to burn. The volatility of it is lower to prevent detonation and preignition. The lower the octane the easier it is to burn. Regarding the extra benifit of higher octane, you are partially correct in the fact that a stock motor will not compensate with advanced timing and leaner mixtures to make use of it. A race engine with 100 octane vs 118 octane will generally allow you to make more power because you can advance the timing and run leaner.

 
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4drcivic2k1 is perfectly right, the higher octane is the gas, the harder it is to burn. This is the reason why high octane gas are used on most "sport" car and turbocharged ones since those car have "high compression" engine. This extra pressure inside the detonation chamber helps the high octane gas burn faster and a lot easier...Our civic being with very low compression rate engine, most of the gas is left un-burned thus poor gas milage.

 
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Yeah, I meant it wont do much on a stock engine.

 
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higher octane is harder to combust, that is why high performance cars use them and not economy cars, i dont understand why people put premium in a non fi civic... it probably does more harm then good

 
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thats right.

now if you want to get even better gas milege start putting NAWZ in your gas tank..... that stuff will burn so easily you'll get like 800 miles out of a tank of NAWZ

 
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yup... with just a little NaWz, your sohc vtec engine will grow an extra cam and become dohc too

 
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I always hear about putting NAWZ in the gas tank, wouldnt nitrous in the gas tank cause a lot more probs than just injecting it when you need it?? Like running only one tank with nitrous wouldnt seem too safe?? Anybody know the answer to this

 
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Nitrous doesn't burn. NOS the company makes a fuel additive "octane booster." Ramboa has the right idea with where he was going, but technically our engines are not "very low compression." They are on the high side of factory cars, with almost 10:1 compression. The combustion chamber (not detonation chamber) is subject to higher pressures under boost which can cause a lower octane to ignite at random. The higher octane prevents this ignition.

 
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Nobody knows the answer to this? C'mon people, I cant find anything on the internet

 
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No, it will not work, because:

1. Nitrous oxide is NOT flammable.
2. At room temperature, Nitrous oxide is a GAS, not a liquid.
3. The only reason Nitrous oxide is a liquid inside the bottle is because of the extremely high pressures that exist inside of it.

 
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Thank you

 
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cmon, not that hard to figure out.....
total miles traveled since last fill up / # of gallons filled up just now

not hard.....

 
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^^^^ times 2

 
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^^^true

 
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i dun think its about being easier or harder to burn... the lower the octane, the less pure the gasoline. Pure gasoline burns much faster than unpure gasoline so that's why filling up on 87 octane gives ur car more mileage, but it doesn't burn as clean as the other.

oh, and don't waste ur money on 93 octane fuel... change ur oil, and get regular maintainence, and ur car should be fine

 
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Wrong. An 87 is just as "Pure" as a 93 octane. The amount of contaminants has relatively little to do with how fast it burns.

 
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93, 91, 89 and 87 are made from the same base gas stock at most refineries. The only difference is the octane boosters and additives commonly used in the higher octane fuels. Higher octane fuel does not auto-ignite as easily (detonation) and allows higher compression and more timing. That's why it's used in high performance cars. Race cars running 13:1 (like my 440 Challenger) use race gas that has even higher octane...

Feel free to add it to your Honda, all it hurts is your wallet, and your reputation if anyone with half a brain sees you putting it into your car.

 
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o.0 well my dad says to use the middle type of gas umm i think its 92 ... cuz the car is new... and you want 2 burn gas more clean...less lead i think...so the engine stays more clean... so the car last longer... now after i read i think i want 2 go to 87 lol

 
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Only reason I run 89 instead of 87 is my slightly higher compression engine. For stock, 87 is just fine and is what the car was designed for. In some cases, higher octane gas has caused more damage to the engine because of deposits or something. Every gas is unleaded now.

 
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All modern automobile fuels are lead-free with the exception of certain race gas. Leaded gas is exceptionally hard on emissions parts, and for that reason, is no longer sold to the general public.

 
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Running 93 won't hurt your engine, but it will hurt your pocket book.

In hot weather when I'm towing race cars with my truck, I will use mid grade instead of regular because the added load and higher temps can increase detonation potential. But that's the only time I don't run regular.

 
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you all say that all octane levels are the same purity, but 93 sure tastes better to me.