premium gas only...ethanol?

[jer_stud56 10+ year member]

I put 89 in my grand am, because it already has 155,xxx miles on it...if it blows up, so be it.

 

[konechiwa 10+ year member]

i use regular. 99 cavalier. Don't flame, It was free (with 25,xxx miles on it, brand new wheels and tires and battery).

But shit, It's 4.20 here, and their is no ****ing way I'm paying 4.50 for 92 octane.

 

[Lingerfelt 10+ year member]

well your pretty wrong. Running cars that are designed to run on higher octane fuels can cause major issues in the long run. Sure a half a tank isnt going to hurt it, but running the lower octane fuel could cause incomplete combustion and detonation, i think.

Newer cars that require premium are programmed to account for people who use regular instead of premium by changing spark timing/etc.

But yeah, not old Eclipses.

I does also believe that higher octance fuels burn cooler than lower octance fuels. And irrelevant of how much of a disparity that is, the LAST thing I want happening to my old Eclipse motor is having it run hotter.

My 2000 Blazer gets AWFUL mileage on premium.

 

[truckramrod 10+ year member]

Yeah, I'm pretty sure Eclipse's have ECM's and Knock Sensors to detect detonation from using lower grade fuel, as do all other Fuel Injected cars.

Higher grade fuel is more stable than lower grade fuel, it resists pre-ignition from the compression of the air-fuel mixture better than lower grade fuel, that's all.

Higher performance engines usually require higher grade fuels, due to higher cylinder pressures.

Using 89 octane gas isn't going to blow up your engine, the computer will just pull a few degrees of timing (if it needs to).

 

[CamryMTX 10+ year member]

The higher the octane doesnt effect performace nor does it make it run better. Sometimes running higher octaine in an engine that is designed for 87 will make it run shitty. The octane rating of a spark ignition engine fuel is the knock resistance (anti-knock rating) The best thing to do in my opinion and what i have read is use what the book says to use. To be honest 87 octain is 4$ a gallon here and thats more than i want to pay.

 

[truckramrod 10+ year member]

There really isnt much difference between 87 and 89 octane A little extra ethanol and thats about it. Depending on where you live, and whichever one is cheaper, that is the one I would recommend.

89 octane gas is not 87 octane gas with extra ethanol in it.

E10 gas is E10 gas no matter what the octane rating.

 

[squeak12 10+ year member]

Yeah, I'm pretty sure Eclipse's have ECM's and Knock Sensors to detect detonation from using lower grade fuel, as do all other Fuel Injected cars.
Higher grade fuel is more stable than lower grade fuel, it resists pre-ignition from the compression of the air-fuel mixture better than lower grade fuel, that's all.

Higher performance engines usually require higher grade fuels, due to higher cylinder pressures.

Using 89 octane gas isn't going to blow up your engine, the computer will just pull a few degrees of timing (if it needs to).

Hes got the idea. Higher octane is only needed for higher compression engines to prevent pre-detonation from the added compression.

Diesels don't have spark plugs because they are high compression engines (~20.1 compression). They rely on the essentially "lower octane" fuel to compress enough to ignite from the heat of the cylinder. As it is compressed, it raises the temperature and causes its to ignite.

 

[faulkton 5,000+ posts]

here all the mid grade gas has ethanol and is $.10 cheaper... i hate ethanol and always pay the extra .10 cents for regular.

in conclusion... **** ethanol.

 

[faulkton 5,000+ posts]

PS: I had a ford ranger that always knocked and pinged like a ***** unless i put premium in it. I don't remember if premium was recommended for it, but i know thats what i ran because it ran so much better.

It was a weird truck tho... it had 8 spark plugs for a 4 cy engine.

//content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif it was NOT a race truck //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif