In light of the new spiked gas prices in the USA i have resulted in using regular 87 octane for my stock CRX DX.
I use to use premium 93 octane but the prices went up and i had to compromise.

my question, which is better for the engine??
Ive heard the rumor that sometimes premium is a waste for some cars and for others it isnt.

the only difference i notice is that i go through gas faster.

what do you say you honda experts?
my pocket, and maybe others on this board is at stake!

 

For a stock engine there is no reason to run any higher then 87. Your compression is low enough and the car runs fine on it. when you jack up your compression you usually get a knock, it means the combustion chamber is detinating before the spark plug if firing, in this situation you run a higher octane. Any Octane higher on a stock engine is a waste of money

 

87 octane for a stock D15.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LSVTEC 91 Civic &raquo;</TD></TR><TR><TD CLASS="quote">87 octane for a stock D15. </TD></TR></TABLE>

 

Putting it in perspective, the 20¢ difference isn't too high.
I usually fill up between 6 and 7 gallons. That's $1.40.
Are you that hard up for cash?

But hey, I'm a cheap bastard, and I know it's all about the penny pinching.
But keeping your injectors clean isn't too bad for $1.50 a tank (Assuming you're using V-power or Techron [might as well if you're springing for Premium]).
Otherwise, just use every other, or every 3rd tank.

 

i use techron.
and where i am, Premium is $2.26 a gallon

 

lower octane gas has more BTUs
BTUs=energy

always use the lowest you can get away with

 

Do you guys use other numbers over there?? Here we have 95 and 98, but we have to pay between $1.3-$1.6 for 1 litre 95

 

Here in North CArolina the 93 is at about 2.35 I think, I sold the RSX-S so I don't use premium anymore...Rocking the 91-DX 87 is it...and itts still 2.14 at the local B.P. station...

 

i use 87 in my 91 civic hatch dx. premium over here is $2.70 a gallon so its kinda expensive

 

sunoco 94 octane by me was like $1.85/gallon last time I checked..

 

You will receive ZERO benefits using a higher octane than 87.......

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civickiller &raquo;</TD></TR><TR><TD CLASS="quote">i use 87 in my 91 civic hatch dx. premium over here is $2.70 a gallon so its kinda expensive</TD></TR></TABLE>

OMFG!! I wish we had those prices in Norway. Then a full tank would cost me $24, but with the current prices I have to pay like $54. And Norway is supposed to be an oil nation (well...it's really the stupid taxes that make the prices). And all the road taxes go to the pedestrians

 

87 is all you need for your dx.

 

yeah in the good ole' usa we get the shitty gas.. 85 octane, 87, and 91 where im at. some states have 93 but i dont know of any states that have higher than 93 from the pump. europeans are lucky, they get the good stuff, but you pay like $3 a gallon more than us. as for me i run 91 octane all the time in my si hatch. i have noticed i get better gas mileage when i do. usually 1-2 mpg extra out of 91.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sanimalp &raquo;</TD></TR><TR><TD CLASS="quote">yeah in the good ole' usa we get the shitty gas.. 85 octane, 87, and 91 where im at. some states have 93 but i dont know of any states that have higher than 93 from the pump. europeans are lucky, they get the good stuff, but you pay like $3 a gallon more than us. as for me i run 91 octane all the time in my si hatch. i have noticed i get better gas mileage when i do. usually 1-2 mpg extra out of 91. </TD></TR></TABLE>

Sunoco offers 94 from the pump. There is also a sunoco near my house that has 100 from the pump but it costs like 6 bucks a gallon

 

you guys are lucky where im from its like 2.43 for 87

 

Im Milwaukee its $2.27 for 87 octane

 

regular 87 is $1.99
premium 93 is $2.13

i liked when it was $1.89-2.00 for premium(93) during winter

 

87 is $2.5x over here

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Shirk &raquo;</TD></TR><TR><TD CLASS="quote">Do you guys use other numbers over there?? Here we have 95 and 98, but we have to pay between $1.3-$1.6 for 1 litre 95 </TD></TR></TABLE>

If I recall, we actually do use a different Rating system.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by http://www.answers.com/topic/petrol &raquo;</TD></TR><TR><TD CLASS="quote"> At present three systems of octane rating are used in the United States. Two of these, the research octane and motor octane numbers, are determined by burning the gasoline in an engine under different, but specified, conditions. Usually the motor octane number is lower than the research octane. The third octane rating, which federal regulations require on commercial gasoline pumps, is an average of research octane and motor octane. Under this system a regular grade gasoline has an octane number of about 87 and a premium grade of about 93.</TD></TR></TABLE>

If you have 87, 89, 91, 93 (R+M)/2, then it's equivalent grades to the US.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SilentWrath &raquo;</TD></TR><TR><TD CLASS="quote">lower octane gas has more BTUs
BTUs=energy
</TD></TR></TABLE>

Care to explain that?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SilentWrath &raquo;</TD></TR><TR><TD CLASS="quote">lower octane gas has more BTUs
BTUs=energy

always use the lowest you can get away with</TD></TR></TABLE>

Not true. The BTUs per pound are the same for both. In fact, they are pretty much the same for ALL hydrocarbon fuels (except very low molecular weight fuels like natural gas, which has a higher BTUs per pound).

 

crx dx isn't exaclty a high performance sports car or anything. 87 will work just fine

 

It's up to you. What do you want? The higher octane gives better gas milage along with a little better performance. I know your tank is only ten gallons like the rest of us (90 CRX). Usually the supreme is only $0.20 more, and that's only $2.00. 93 octane is $2.29 here. I live in Batesville, AR, and we have a Phillips 66 out here that sells 101 octane. It's 4 something a gallon. Which I don't understand wy people get that. You can go about 2.5 miles down the road to the Airport and get 110 Octane for $3.00 a gallon. Just take a jug in, and tell them that you race at the Batesville Speedway. Pay for it. Walk out. Stop down the road a put it in the tank. They don't know the difference. Sorry, got off the subject. The higher octane fuels are supposed to have a more complete burn cycle. Which in return leaves less residue in the cylinder. What I am trying to say is that the higher octane is a cleaner fuel. My T3 turbo d16a6 has gotten 41.6 mpg on the freeway. In town driving, and also driving to work, my little Rex is still getting 35.9 mpg. If I do a little bit of racing it drops to 28 or 29 mpg. I'm still not complaining because you can't drive a V8 and get close to that, and still be able to beat the V8 Stangs runnin' round here. If you weigh the options the 93 octane will come out on top.

Just to keep the arguement going