i think ive read somewhere that the LE5 has two fuel maps it runs off of depending on what octane you fill with...

if this is true...it really wouldnt matter what octane you fill...you will have worse knock with lower or octane, but if you are driving it in high rpms, im sure you fill with premium already.

 

All cars have a high and low octane table.


Really wanna **** with a car?

Put 89 in it and watch the PCM not be able to determine whether or not to use the high or low octane table.


And before you car can turn down timing, IT HAS TO KNOCK.

 

I don't believe it has anything to do with "maps" in the computer tables.

For the simplest explanation -- when the knock sensor detects "knock" (preignition) the ECM reduces power by retarding timing AND cutting fuel. Performance and mileage suffers. The highest possibilty of "knock" is under both WOT and under load conditions(load -- like going up a steep hill in high gear). If you drive like an "old lady" and don't put your 2.4L under those 2 conditions then 87 octane will work.

 

thats what i ment.

 

I am quite confused as to the gas mileage of some of your guys's cars.


When i went cross country (IL to UT) -- 16 hour drive....

I was seeing a steady 42mpg.

Now with the turbo, I see 43-45mpg.

This was with premium.


I only saw 32's with 87.

 

this thread pops up like every week from a new person..

 

ive only put 93 in mine. I haven't thought about anything lower.

 

You American ****'s are lucky that premium is so damn cheap for you. Yes, I said CHEAP. Premium here is like $6.36/gallon when you do the conversion.

Still though, premium or nothing.

 

135.4 to 131.9 a litre for premium average there and about 107.8 to 96.9 here depending on where you go, and the US dollar is 4.94 cents less than the Loonie today, which I adjusted for. So not that far off.

 

Are you sure about that average on Premium in Canada? In BC, our REGULAR is around that 1.31 to 1.35 mark. At one point this year it was 1.50 for regular. Even with that difference between US, and Canada.......remember those prices are per liter, not gallon. Based on 1.30 vs. 1.00, that's a difference of $15 per 50/L (13 gallons or so).

 

3.75 litres to a gallon, and Prices are from Gasbuddy.com as of today. So I converted US into litres then deducted 4.95 cents per dollar from the US prices which is todays difference in the exchange rate.

Unless my math is flawed, or your not shopping around (online ofcourse) And my canadian was for Edmonton.

3.78, my bad

 

Heh, Please stop beating the dead horse. There is no performance difference between 89 and 91,92,93. I have done enough 0-60 tests with my dash-hawk to see that there is no problem with detonation with 89 either. More than likely any perceived increase in performance with the higher stuff over 89 is a placebo effect.

I have never run 87 in mine so I can't speak to that. In my area 89 is a good 10c cheaper than 87 and 30c cheaper than any premium. So I stick with 89 cause it's still cheaper in the long run for me.

 

Well seeing as the Octane rating of gasoline only refers to its anti knock properties as a result of resistance to auto-ignite than I am sure that you don't see a performance gain, but you should see a long term fuel consumption difference, and I do not include ethanol as its partially oxidized hydrocarbon not carbon-carbon and has totally different molecular and combustion properties. Your lower octane fuel is igniting earlier than your higher octane fuel the higher compression engine was designed for and so you are running closer to detonation, not that you are but you are closer, so you are not maximizing the efficiency of the engine, I didn't say power, I said efficiency, because you want the fuel to ignite when the engine reaches maximum compression because that is when the rest of the cylinders are in proper alignment to enter they next phase of the 4 stroke cycle (you know intake, compression, power , and exhaust?) So the engine is working harder because you are trying to impart motion on the crankshaft earlier in its rotation than it was designed for. This is getting long, lets just say it wears **** out faster too.

 

For those trying to convert the price of fuel for Canada, just put it in Google like this

"1.5 CAD per litre to USD per gallon"

and you'll get


1.5 (Canadian dollars per litre) = 5.41960433 U.S. dollars per US gallon

E-Town SS hop over to google and you'll see that no one in Edmonton is paying $6 per gallon.

 

Your math wasn't flawed.......but neither was mine. Of course 30 cents difference doesn't sound like a lot, but that's only because you're used to thinking in $$ per gallon and not per liter. 30 cents difference per liter is a lot.

 

No one says numbers will differ...but I have logged a few 2.4's that were on midgrade and some V-8s with mid grade.


They should abolish the idea.

Knocks like crazy.

On a stock 2.4 I saw 3-6* depending on how hard I was...and the V-8....7-10*


ON STOCK TUNES!

 

people just will not part with 1 ******* dollar, to give the car the fuel it was tuned for

run your low test fuel. who gives a ****.
i sure dont.
people dont want to listen anyway.

 

+1 only about $2-4 dollar differance per tank, if you can not afford that I think you bought the wrong car.

What is it $0.20 differance from 87 Octane to 93 Octane and with a 13 gallon tank lets do the math $0.20 * 13= a whooping $2.60

Just buy the right gas!!!

 

I have to say that was very well put.. enough said...end of discussion!!!

 

Apparently until it's offspring's offspring are dead...

 

Numbers from data might not lie.

However, I do know that when I run 87 (pre-Turbo) car felt slow and sluggish.
when I put 91+ (pre-Turbo) car felt more peppy and got the rpm's up faster...however I know it took 2-3 tanks to tell the difference.

 

I have never run 87 in my car. 89 is 10c cheaper than that and at least 35c cheaper than premium round here. So that's around $4.20 round difference round here.

I would never run 87 but 89 doesn't change the 0-60 times of the car and the loss in mpg for the 10% ethanol I not enough to make 92 worth it overall.

Your area may vary and it really depends on where your fuel prices fall in your area. If premium were only 15 to 20c more it would be worth it. If I had an SC or turbo there I would run 92 all the time.

 

Instead of argueing what is better for the car, why not just post your mileage you get, the octane fuel you use and where you buy it and for what amount. And list your mods, then you can compare yours to others.

My only mod thus far is the GMPP CAI (or SRI if you will), I got 37MPG AVERAGE with 93 octane. I pay about $4.11 / gallon at kwik fill.

 

gas is gong down here in norht jersey, i just payed like 3.7x for 93. on 93 in the modded 2.0 i can get over 40 mpg highway at about 75-80 mph trying to go easy on the right foot, and i can get over 30mpg in traffic. on my drive to long island memorial day weekend (people from new york/new jersey know how that can be) i got about 32 mpg. and traffic doesn't get much worse than that. took about 4 1/2 hours to get there, and a little over an hour to get home at 2 am for reference. with zero traffic would have been less.

if i don't try to get good mileage, it's obviously not that good. i don't drive like an idiot, but if i hit a ramp on a highway that's pretty empty i'll give it a good run, i like to hear the whine every now and then. or if i'm on a nice twisty mountain road like we have up here, i'll give some gas. but i usually fill up once a week, which includes driving to work every day, and travel for work on the weekends when i'm filming weddings.