octane levels.. .is it true that 93 octane is too harsh for the lancer pistons? or what? i always use 93 octane but someone on the forums said the rings cant take it.. what's the deal?

 

i dunno about 93 octane burning up rings or pistons or anything, but i always 87 b/c thats the cheap stuff and i'm cheap, but my car runs great even with the cheap stuff

 

i dont think its good for the lancer to get 93 octane it's too much, thats what i think, and dont put 87 either, you wont get as much power, just put either 89 or 91, i'm using 91, and it feels good

 

have you ever switched octanes and been able to tell differences? if it's worth it, i'll just have to save up that extra $0.10 a gallon.

 

i am no expert on this but I don't see high octane hurting the car other in that maybe it might not ignite like it should, since higher octane gas withstands detonation better than low octane gas, and this may throw off timing a bit....but I can't see it hurting the pistons or rings....just my 2 abe lincolns'

 

sounds about right. the only other issue i see, is the higher octane burns at a higher temp so it might cause your engine to run slightly hotter than if you were using a lower octane like 89 or 87. but again i don't see it hurting anything although it probably isn't a good idea to switch it up every time you fill up

 

The higher the octane rating of a fuel the more resistant to preignition it is. Therefore a 93 octane fuel is more resisitant to preignition than 87 octance is, which is why in high compression motors, or those using high levels of boost, a high octane fuel is required.

High octane fuels have less energy per unit mass than their low octane counterparts, primarily due to the chemical differences in the components of the fuel, which are determined at the refinery. By using 92 octane in a vehicle which only needs 87, you are actually losing potential power, albeit negligable, from the engine.

What this means to the average joe driving his car is that using either 87 or 92 will make no difference in the way the car performs, unless you are driving a vehicle with the engine characteristics mentioned above.

Back in the heyday of formula one racing, when the octane rating of the fuels they could run was limited at a set number by the governing body at the time, petroleum companies (elf in particular) came up with some witches brews of organic chemicals (toluene, xylene, various alklybenzenes, etc.) which when tested in the laboratory gave very low octane ratings, but when used in a racing motor provided huge gains in power. One unfortunate side effect of this magic was that pit crew members had to wear gas masks, as the exhaust was highly toxic...

But I digress.

 

Just use the recommended octane level, which would be 87 for the Lancer. Higher octane levels are for higher performance cars.

 

can higher octane gasoline actually make your gas mileage worse?
it seemed like when i used Regular gas, i would get 240 miles for 10 gallons..so that's 24mpg
and when i switched to Premium gas, i got 215 for 10.5 gallons..about 20 mpg.
i generally thought higher octane gas should help gas mileage since it's easier to detonate..but im confused right now
-Bob

 

Search.

 

I've only put 89 in mine, rather than the gas cover recommended 87. In the long run, from my experience, your engine will run cleaner than using 87 all the time, and the price is negligible. I wouldn't recommend 93 or higher octance, because as stated, its for high compression engines, and yes Bob, its possible running premium would drop your gas mileage.

D

 

Find that Using BP/Amoco I Get

30.5mpg/Regular
31.8mpg/Plus
30.3mpg/Super

I have more than 15k on my Lancer, and documented every tank of Gas for the first 10,600 Miles (4 Oil Changes)... This was a mix of driving, but more than 2/3rds of the mileage was highway.

 

I agree, I just use the 87..it says right there on the gas door..unleaded fuel only. whats 87?...unleaded fuel, more is just a waste of money, and yes, that's for like the sports cars n ****

 

There's another couple of big threads on this subject that answer the question in more detail for those interested, but DannoH did a great job of explaining it as well.

 

i used unleaded rice.....
....