87-89-91-92 Gas
 

Guys...........Am i nuts or am i nuts. I have been using 87 in my car for 6th months. Last week I droped the Highest Sheets gas that they have -91- I have been getting some sweet MPG. Already at 260 and I still have half a tank left. That seems to be about 60 more than i usually got. I only have a K and N drop in. And i drive it the same way all the time, back and forth to work.

Is this just something crazy or does this higher grade gas actually get us 1-2-3-4-5 mpg more??

let me know what others think and have seenjavascript:smilie(':damn:')
javascript:smilie(':damn:')

I think its just a coincidence, using higher grade gas in an engine not designed for it can actually mess up gaskets and seals and stuff, I would suggest not messing with it.

i've made the switch to 91... and the first 2 tanks gave me equal mileage... but my 3rd tank gave has been giving me better mileage... almost 50 more kms....

Never thought about it, might try it.

on 93 octane i can get over 400 miles on about 10 gallons

now calculate your mile per dollar ratio.

see if the increase mileage offsets the extra money.
if it does, then awesome. use higher octane more oftern.
if it doesnt, then well... stop.

dont listen to what everyone is gonna says i always use the higher octane i get much better mpg and the car is faster, now i dont use nothing but the highest octane probably wont do much fir you if you dont have mods

Here's my take on the matter, If you are getting better gas milage, good for you, if you're feeling more power, good for you. AS far as my experience, it didn't do a damn thing.

The chemistry behind it is as follows,
A higher octane, will withstand more heat before it burns, so, therefor it is very useful in a higher compression engine.(>10.0:1)
A lower octane will withstand less heat before it burns, more useful for lower compression engines. (<10.0:1)

Higher octance gasoline isn't any more efficient, cleaner, or more powerful, it just resists combustion more.
SO, the reason why you use higher gasoline is if your compression is higher, a higher compression means more power.
NOW, if it's really hot out (like really...), you could potentially see some benefits from a higher grade of gasoline, but probably not. Another thing, if it takes a porsche 2-3 full tanks of race gas to reset it's ECU to take advantage of the higher octane...(advance the timing) Then I doubt your civic does it instanty.

Now i'm not going to call anyone a liar, but I'm a firm believer in science, and this is what science tells me, now if you actually are getting better results cool for you. Have I, no.

I was just about to make a forum about gas... I used to use 91 octane but then on the island of oahu the price of gas just sucks, right now it's 2.16 a gallon. But anyway i was running 87 octane for a few months and just tonite i made sure i drained my tank till my gas light went out then went to chevron and filled em up with 91 octane and spent 23 bucks. I noticed that it my drive was smoother and i never had to push as much gas for it to go... i dunno i think there's a big difference in driving and i know i used to get about 350miles at a little below half tank with 91 octane and about 320miles when using 87 octane... just my .02.

86 and 87 suck a$$. Renamazazo-science tells me that all things being equal, the simplest solution is usually accurate. I am a firm believer that I get better gas mileage when I use 89. And yes, it is beneficial financially...I've done the calculations. Well, at least here it is, but I don't pay $2.16/gallon!

damn how do u guys get such great mpg? the best I ever got was 320 out of a full tank of gas, thats my record and I drove with the gas light on for like 10 miles too...

I just finished my last tank for my trial... this is the math that i got outta it... (hopefully there are no errors)

Here are the results:

If I pay 63.5 cents a litre for 87 octane, and i get 400kms on a 40 litre fill up it costs me: $25.40 for a full tank, and equals to 15.74 kms a litre

If I pay 73.5 cents a litre for 91 octane, and i get 480kms on a 40 litre fill up it costs me: $29.40 for a full tank, and equals to 16.32 kms a litre

So what i found is that I get better mileage, my car runs smoother, i feel a little more kick, and i'm using better gas.... I was a skeptic before, but now i'm all about Petro Canada Superclean...

(this test was based on 3 tanks of each kind of gas, similar range of highway and city driving, and moderate sessions of "lead-foot", all funds are in Canadian dollars, and mileage is not in miles but in kilometers)

Try it for yourself... don't have to believe me... not everyone will get the same...

can you convert that to american stuff??

Key to good MPG. KEEP THE TACHOMETER below 3000 as much as possible.......on the highway keep it around 65-75mph

and hit it easy in the city

hey guys....I'd like to hear more from other people.

I have a 03 Civic EX Coupe, auto, with only KandN drop in

I made the switch to 89 octane months ago, I definitely notice a difference in MPG and throttle response.

update.......i am at 310 and it is now about a needle width below the half tank line.........lets see if i can get 400-450miles total

i get 300 miles per tank on 93 octane :(

<---boosted though

Throttle response and gas mileage have gone up...

It is a tad bit pricier though...

holy moly... hehe. 310?? i'd be heading for a gas station. I guess you do a lot of long distance driving? cuz a lot of my driving is like around 12 miles or less and in a lot of city/traffic driving.

where are the real honda techs. you guys speak nothing but through dollar and driving experience. :please:

our cars are designed for 87, period. something with the engine igniting 87 octane fuel is easier than 93 and so on.

Hmmm, this thread makes me want to test how far my car can go off of one tank without being lead footed. Hell just drive until it runs out and have a small tank of extra gas so that I can post the best mileage.

Anyways, I have been recording my gallons bought and mileage since I bought my car and put it all into an excel spreadsheet. I have recorded a best of 338 miles and only using 9.726 gallons. Giving me only 34.75 miles per gallon. I am willing to try out this and give some actual data with actual numbers not just 400 miles. Though I am drive when I go home from school so this information will not be found fast.

actually my driving consists of 10 miles on the highway, and 10 in city stop and go everyday for work. I wouldnt say i baby the gas, but then again i dotn STOMP on it at get the tach up to 4500-5000.....i try to keep my shift points (i have an auto) at about 3000-3500rpm.

I am just wondering after all of this if its worth getting the 93 oct.

87 here in cleveland costs me around 1.50 gal
93 here is about 1.70gal

so is it money wise worth it to fill up 10 gals and spend the extra $3.00,

plus our cars all say 87 in the book.........so you must wonder if they actually made this car for 87 or if thats just a minimum grade.

^^^ they did make this car for 87. they make all cars for a certain grade of gas (usually).

but does that mean that this car is made to perform its best with 87........


or is 87 just the lowest that it can handle?

I believe 87 is the lowest it can handle. It is made to reccommended, but of course you can go higher.

I get 350+ mile/tank boosting 7psi on a return system with 94 octane.

Same mileage with 93 octane

Same mileage with 91 octane

Same mileage with 89 octane

Same as when I wasn't boosted at 87 octane

yeah me too, I was doing 87 for a long time and I saw a trend I spend more money for 87 and get less miles than 91, when I made the switch I started to save money not a lot but a few dollars here and there and my gasmileage really went up and I stay 91 for now on

Not sure what to make of all this but my car just seemed to drive smoother and get better gas mileage as well on premium. Since its a civic and only takes 10 gallons every time i fill up, I'd gladly pay the extra buck.

in my 2003 vic manual it says "Your honda is designed to operate on unleaded gasoline with a pump octane number of 86 or higher... We recommend gasolines containing detergent additives that help prevent fuel system and engine deposits... In Canada, some gasolines contain an octane-enhancing additive called MMT. If you use such gasolines, your emission control system performance may deteriorate and the Malfunction Indicator Lamp on your intrument panel may turn on."

So it shows, that using higher octane for our are car, is just fine.