Well between where i live in DC and where i live in pennsylvania our choices for gas are (sometimes 85) 87, 89, and 93 octane. Now i personally choose to run 93 octane in my car but is that what im really getting? or am i just paying out the a$$ for 93 but really getting 87 (or at some stations 85) out of the pump? now i know what your thinking... "just keep track of your mileage moron." Well my answer to that is with the traffic the way it is and the total randomness of it, its almost imposible to keep track of the mileage around here. now sometimes i fill up at a certain station (with 93) and my gas seems to last a while and then sometimes i fill up at a different station (with 93) and it doesnt last long at all... whats up with that? did i pay for 93 and still get 87? i saw something on the news about gas stations in most states only get checked about once every 3 years (some even longer than that)... and on top of that there are 6 states in this country that allow the gas stations own workers to "check the pumps for accuracy." now i dont know about you but i already feel im getting ripped off at the pump with the prices, so when i choose to pay more for 93 i better f*ckin get 93! just a little curious to see what other people think on this matter

 

ha i think about that all the time..i wish their was a sumthing i can stick in the gas tank(no homo) to read how much octane their is after a fill up.

 

well what about 93 and octane booster? i have ran that befor but i question if the booster does anything

 

if the gasstation sells u 93..u should get 93 and not have to worry about getting any octane booster

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by v8 integra &raquo;</TD></TR><TR><TD CLASS="quote">if the gasstation sells u 93..u should get 93 and not have to worry about getting any octane booster</TD></TR></TABLE>

....exactly. and after watching that news program i saw, i know that there are alot of shady gas stations out there. it just kills me to know that atleast half the time im probably getting ripped off and theres not a d@mn thing i can do about it.

 

octane booster gives a negligible boost it's like .2 or some **** based on averages..higher octane does not = better gas mileage...

in general it's going to be +/- 2 octane

unless you are required by a tune or your motor to run that high of octane run 87 or 89

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DTA-Zombie &raquo;</TD></TR><TR><TD CLASS="quote">
unless you are required by a tune or your motor to run that high of octane run 87 or 89 </TD></TR></TABLE>

i am required... if you look in the owners manuel for the d16z6 engine, it states that this engine should be run on nothing less than 91 octane. the point is if i choose to run 93, and i pay for 93.... i should get 93 and shouldnt have to worry about buying octane boosters

 

I think your mileage will change more depending on ethanol content. My gsr gets about 31 mpg on 87 91 and 93 from the same gas station, but if I go to one that says 10% ethanol, I get about 24-27.

Unfortunately, here in the midwest about 80% of the gas stations are only 10% ethanol.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Eg2Love &raquo;</TD></TR><TR><TD CLASS="quote">

i am required... if you look in the owners manuel for the d16z6 engine, it states that this engine should be run on nothing less than 91 octane. the point is if i choose to run 93, and i pay for 93.... i should get 93 and shouldnt have to worry about buying octane boosters</TD></TR></TABLE>

are u positive? I constantly run my z6 with 86/87 octane. Have a pic of the manual?

 

I dont think d16 requires anything more than 87.

 

The manual states that 4th generation civics should only run on 91 as well. This came up a while ago and if I remember correctly the Japanese use a different grading system and our 87 is equivalent to their 91. So, yes you have been wasting your money for however long. You don't need to use anything more than 87 on a d-series unless F/I or higher compression are involved.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Eg2Love &raquo;</TD></TR><TR><TD CLASS="quote">i am required... if you look in the owners manuel for the d16z6 engine, it states that this engine should be run on nothing less than 91 octane. the point is if i choose to run 93, and i pay for 93.... i should get 93 and shouldnt have to worry about buying octane boosters</TD></TR></TABLE>
The D16Z6 takes "nothing lower than 86 octane". It DOES NOT take 91 or higher. I believe you might be confused.

https://honda-tech.com/zero...age=1

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NOFX &raquo;</TD></TR><TR><TD CLASS="quote">What manual are you looking at?

I'm looking at the '94 del Sol manual right now and for the S and Si models it says to use nothing lower than 86. The VTEC (B16) model it says to use premium (91 or higher).</TD></TR></TABLE>

From the service manuals:

1992-1995 Civics


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">Fuel Required

U.S.A
Premium UNLEADED grade gasoline with 86 Pump Octane Number or higher

CANADA
Minimum 91 reserch octane number</TD></TR></TABLE>

1996-2000 Civics


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">Fuel Required

D16Y5, D16Y7, D16Y8
UNLEADED gasoline with 86 Pump Octane Number or higher

B16A2
Premium UNLEADED gasoline 91 Pump Octane Number or higher</TD></TR></TABLE>

 

I have "heard" that 87 and 89 get mixed regularly if one is out or the other... no real difference besides the dime.

 

find a reputable gas station and stick with them. if your gas lasts longer from a certain place, go back there
there will always be somebody trying to sell you something it's not

 

If you're putting anything other than regular 87 in your D-series (assuming it is not highly modified), you're simply throwing money away. Period.

 

i wouldn't necessarily say that. i've found on a number of cars that the higher octane gives me more mpg. so it's probably about the same cost per mile only it's better for the engine
i will admit that may not be true for all, depends on the ecu and other factors

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zrickety &raquo;</TD></TR><TR><TD CLASS="quote">i wouldn't necessarily say that. </TD></TR></TABLE>

I would. If your engine is tuned for 87 octane (as many cars, including Civics with the D-series are) then there is no benefit to running premium fuel.

 

ron+mon/2 sometimes more sometimes less.

just a grade.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zrickety &raquo;</TD></TR><TR><TD CLASS="quote"> i've found on a number of cars that the higher octane gives me more mpg. so it's probably about the same cost per mile only it's better for the engine</TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by i drive a honda &raquo;</TD></TR><TR><TD CLASS="quote">ron+mon/2 sometimes more sometimes less.

just a grade. </TD></TR></TABLE>
Octane rating is just a numeric scale representing the resistance to ignition, the higher the number the harder it is to ignite. Octane has no effect on milage, only preignition. However the number of shady station operators will have an effect. I've also wondered why at some stations with the same amount of fuel into the tank it mialage will vary. Almost as though its evaporatingfrom the fuel tank.

 

i have a y7 in my ek and when i put 89 or 93 i get better mpg rather then 87 so i think its just a matter of your opinon but octane booster is def a waste of money doesnt raise the level at all
but putting higher octane in is better for the motor but i dont think hondas have to worry about that lol
brother has a 04 tsx 257k and still runs great

 

i will give you that octane affects preignition, but it also affects what the sensors see and what the ecu does. i had a ford tempo, pontiac trans am, chevy beretta, chevy blazer, a crx dx and my current crx si get DRASTICALLY different gas mileage depending on what octane i put in the tank. i know i'm not alone ^^^

 

If a "Higher octane fuel = better mpg" post were put on certain sites it would create a firestorm of debate. I'm not going to argue facts.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zrickety &raquo;</TD></TR><TR><TD CLASS="quote">i will give you that octane affects preignition, but it also affects what the sensors see and what the ecu does.</TD></TR></TABLE>
What sensor is it you think will "see" the octane level of your fuel and how does it alter what the ecu does? The only one I'm aware of that will "see" the quality of you fuel is the knock sensor, if you have one. The k.s. will detect preignition and the ecu will react.

 

i appologize guys, i didnt start this thread to start debates and thats all it seems to have turned into.... i was just saying that if i CHOOSE to run a higher octane (weather or not it holds any true benefit to my car) i better get what i pay for. and just wanted to see if anyone else felt like they were getting ripped off by paying for 93 but only getting 85 or 87

 

I've heard too that the gallon counters on gas tanks are screwed up too. Pay for 9 and get 10. A couple places in chicago got in trouble for that.

 

I agree you should get what you pay for. I found this doing a real qiuck search out of curiosity.http://www.zeltex.com/portable/zx-101c.html I didnt see any price info but I'm sure its a couple hundres bones if not a k or two. I'm sure with a little more time looking there is something out there for the average joe to use. I was thinking I would find a test strip type test or something , but like I said it was a quicky.
Just found this one for 200 duckets
http://cgi.ebay.com/ebaymotors...wItem


Modified by nub at 2:58 AM 9/19/2008