Nrp603

So right now I usually put in 93 unless i come across 91. But I once heard every now and then you should put in regular for some reason?? is this true? or should i add something into that gas every now and then to help the engine?

justnspace

iTrader: (1)

no. keep putting in 93. and thats all you have to do.

AirForceFX

Yeah, who told you that?

Justn. "The Departed"? You're silly.

Drewman752

If i do cross country trips, i do 2 fills ups*when i get half tank* of 93, and 1 with regular. Then switch back to 93 and repeat. But only if im driving say from Utah to Michigan, Regular city i do 93 only.

ttribe

No and no. The only thing is you might want to use a "name-brand" from time to time to get their cleaning agents. Otherwise, you shouldn't need to a thing.

Ch33sE1

You got it the other way around. If anything you should put in even higher octane once in a while so it burns all the excess gunk left in your engine.

AirForceFX

May I ask why? There is no way its to save money as the difference is dimes at final cost when filling up between the two!

Drewman752

I noticed a change in MPG. When i would do the 93 before the regular it would be low 25 - 28. but once i went with a half tank of regular and then 93 after it would be 31 - 32.. so it was something i just do now when taking long trips. Basically did it just to see if there was a difference in MPG. But if i would do just regular with a full tank, car would be slugish and end up getting crappier MPG. It was weird haha.

sleeper22

Higher octane has always given me about 1 mpg better than lower octanes. I never put less than 91 octane in the TL.

RaviNJCLs

iTrader: (4)

91 or higher. IMO lesser gas will end up costing you money in the long run. Also, if you use good gas you should never need any additives.

Let me ask....who told you to use regular?

Nrp603

not sure who told me I thought i heard it somewhere.

RaviNJCLs

iTrader: (4)

Here is what I know....I drive about 40K miles a year. Prior to buying my TL I had an I35 with 188K miles. Always used premium. When regular was put in it I got about 2-3 mpg less and the car ran like shit.

It is not worth it. Put 91 or above. If you do not drive a lot then it does not cost you that much in the long run.

emeka206

Premium 93 (Preferrably BP or Shell)

Jesstzn

The octane has nothing to do with burning off "gunk" its the additives put in the gas that does that.

The higher octane helps prevent pre ignition in higher compression engines.

av2600

iTrader: (1)

all i put in mine (now) is shell v-power 93.... I was advised anything less wasnt good due to the compression ratio of the type-s (i think i got that right!)

justnspace

iTrader: (1)

^correct, Both the base and type-s have an engine compression of 11:1
Which is super-duper high! race car status!

SouthernBoy

This is an old wive's tale and is not true. Higher octane fuel burned in an engine which is not design for its use will burn less efficiently, produce less power, return lower fuel economy, and impart more partially burned contaminants on combustion chambers and valve faces. Higher octane fuel has a higher flash point which is only taken advantage of with higher compression and a more aggressive spark timing.

Jesstzn

Just interesting reading

Quote

The word "Octane" is the measurement of a fuel's resistance to detonation, so by definition, higher octane has higher anti knock quality. Octane numbers up to 100 are roughly the % content of trimethyl pentane, which is extremely knock resistant. Knock is a difficult subject to discuss because there are many different terms with weak definitions used interchangeably in many text. Basically, every engine has an octane requirement for max power, based on combustion chamber shape, piston design, temperature, speed and other factors. The octane requirement varies greatly with temperature, 16F of coolant temp is 1 RON , and 20F of intake air temp is 1 RON. An ideal ignition system is designed to ignite the fuel mixture so it burns and reaches peak pressure around 15 degree ATDC to get max work from the fuel. The burn time is relatively constant (2ms), so as rpm increases, you need to fire the ignition earlier (advance) to reach peak pressure at the desired point. At higher rpm, the burn time takes more degrees of crank rotation. Knock occurs when the unburned fuel mixture spontaneously ignites before the flame front reaches it. The term octane refers to a fuel's resistance to spontaneously ignite. Engines with wide VIA's and large combustion chambers (like hemis) need more time to burn all the mixture and are more knock prone. Add domed pistons which make a poor combustion chamber at TDC and things get worse. Add air cooling and it gets even worse. Most 911 engines are detuned with compression and timing by the factory to operate with a margin of safety for a "chosen" octane fuel. Many of them will make more power with more timing if you have the octane. If you study the history of hemi engines, you will find that the highest specific outputs were made with very high +12:1 compression, twin plugs, and exotic alcohol based fuels with theoretical octanes over 110. Water cooled, DOHC 4 valve, pent roof engines with compact combustion chambers and flat pistons have a much lower octane requirement.
Unquote.

stvtec

iTrader: (2)

11.5:1 !!!

justnspace

iTrader: (1)

honda news doesnt lie.

lucnex

iTrader: (3)

stvtec has the .5 compression addition mod....you havent done that yet?

justnspace

iTrader: (1)

werd!?!??!

does it involve stickers?

erdoc48

^^ Exactly- if the TL was designed to run on 87 octane (regular), this is what I would use. All gas has detergents. We've all been made to think higher octane is better, which it isn't. It's basically protection against pre-ignition. Heptane is very flammable and the octane is essentially a flame inhibitor, so the ratio of heptane to octane determines the grade of the gas (it's possible I have the formula backwards). Super isn't really 'super'...if your car or MC can run on 87, that's what you use. In NJ we don't have 91 octane, so we typically have to use 93- it won't hurt or help the engine though.

lucnex

iTrader: (3)

A few stickers...and of course...this: http://cgi.ebay.com/ebaymotors/2006-...Q5fAccessories

borrowman

You may want to check out www.toptiergas.com
It lists stations that carry fuel recommended by Acura and other premium auto manufacturers. It is based on detergent levels in the fuel. Click on "Retailers" for the list.

SatinSilverAV6

iTrader: (2)

If you have access to 93 octane then use it over 91 octane. Unfortunately we are stuck with 91 octane here in arizona. The higher the octane gas, the richer and more efficient the fuel burns. Running 87 octane in the TL is a crime. All you are asking for is knocking/detonation. The ECU will retard the timing to try and prevent detonation hence a reduction in power and efficency. With the knock sensor the TL greatly benefits from higher octane.

Guiltyox

Having lived on BOTH sides of this country, and been through half the states in between coasts, I can vouch that 93 octane doesn't exist in a lot places. Where I live, unless I visit a Sunoco (sponsors/provides gas for nascar), there aren't any 93 pumps, but 87, 89, and 91. So 91 is perfectly fine for your car. Having owned a TL now for 3+ years, I never had an issue with 91. 87 being regular unleaded and 89 being a mixture of 87 and 91 (literally mixed right there at the pump, these days). Where 91 will give you a little more robust combustion, a little more bang for your buck, it will burn a tad faster as well. Running 89 in your car every once in a while wont hurt either :-D. Just food for thought!

stvtec

iTrader: (2)

Truf!

Thanks for the correction correction. I read elsewhere that it was 11.5.

Flipster23

iTrader: (15)

that website

leedogg

you sure you arent confusing it with switching gas brands every so often? I think I read somewhere that doing so will allow the detergents to clean up after one another. For me the ideal scenario would be to rotate between shell and chevron.

ez12a

91 doesnt hurt since it's all what californians have at a typical gas station.

Hacura

We had 92 and then they dropped it another point...I've never looked into what caused that change but it's probably those damn ecofreaks .

Drewman752

^ prolly corn lol

loc05tl

Man, I live around LA area in CA and never cross by any gas stations with 93. The highest that we have here is 91.
Random question: is Arco gas considered a good name ?