discreet303oz - When I threw 93 in mine, I didn't do anything special. It took a tank or two to see any results though. I guess the old stuff just needed to burn through. So as far as I could tell you, get the tank pretty empty and just fill 'er up.

CulebraLancer - 93 is usually the "super" stuff. Yes, there is a difference in the quality of the gas! However, I'm still not sure what is the best and what is not. I was just happy that I was getting better gas mileage. My experiences with BP have always been a couple of miles per gallon less than I get with Shell. If you experience and find that one is better than the other make sure to let us all know.

WADADLIG_OZ - As far as the whole unleaded regular only thing... I don't even think that anyone even sells leaded gasoline anymore. Leaded gas lost it's popularity in the 70/80's, but they still need to put the labels on the cars because you do run across the occasional oddball that sells the stuff.

 

Putting in higher octane will do ABSOLUTELY NOTHING toward making your car put out more power, or in fact run better. Octane is pure, plain and simple, a solvent used to alter the flash point of the fuel. Higher "performance" cars and turbo systems require higher octane because of the higher effective compression ratio present in the engine. This higher compression ratio results in much higher compression temperatures and can lead to flash burns of the gasoline which is one of the forms of knock and detonation. Octane is NOT a performance adder unless you are advancing the hell out of your timing... then it can give horsepower only because of the fact that it allows you to advance your timing without experiencing detonation.

In fact, if you pay more attention to your actual mpg, you will see LESS fuel efficiency running a higher octane, and in fact can see a lower power output from the engine.

Plain and simple SAVE YOUR MONEY and run the lowest grade.

 

steve you always top the posts in a thread with the best explanations of everything

SOMEONE MAKE THIS MAN A MODERATOR ALREADY! lol

i wanna try a 93 octane once and just so i can say i used it before lol.

 

LOL Thanks mike

Those of you who are getting better gas mileage... same company or not? same driving habits or not? same mix of highway and town or not? Because you really should only get the same or slightly worse mileage with the high octane. I believe it is due to a slower moving flame front in the cylinder (yes gas actually burns.. not explodes when the spark ignites. exploding gas in a car is BAD (knock/detonation)... burning gasoline mix in car... good )

Unleaded was sold because the lead was used as a lubricant (yes I'm positive on this) that was important for certain parts of the engine like the carburetor for some reason or another. Technically your car can run it.. but it'll destroy your catalytic converter... and I've heard that it supposedly could damage/clog your injectors.. but otherwise is ok But yes it's hard to find. Anyone that runs a lead needing car (like an old triumph or something) just buys the lead additive and adds it to standard gasoline.

Another thing to pay attention to as far as your mileage versus octane versus gas station is the percentage of ethanol in the gasoline. Some places have 10% ethanol.. some even as high as 15 I guess... the ethanol is in there to improve the burn to reduce emissions.. but unfortunately reduces the actual overall output possible from that fuel mixture.

Hope that all helps clear this up more.

Later.

Steve

 

Put down your crack pipes for a few days and then check how you're doing with 93 octane. You'll find, when you are sober and have full control of your faculties, you are doing the same as or ever so slightly worse than with the 87 your car is designed for. The ONLY reason to use higher octane is if you are having pinging/knocking/detonation. That is the ONLY thing octane can help with. It will not give you higher mpg, it will not make your car any faster, it will not get you a date with that hot girl/guy you are wanting to go out with. It WILL drain your wallet faster. That's it.

 

HAHAHAHA funny LBD

What about the original post of this topic with what I was referring to as the "backfiring"

WADAD

 

Actually, Boeturbolancer explained that higher octane also burns slightly slower, and the controlled burn AND the higher flashpoint are required for high performance cars to avoid predetonation. But it won't do any harm nor good for the longevity of a normal car (like the Lancer), and will have a tiny (unmeasurable) performance difference.

edit: sorry, back on topic

 

i don't know, my car runs better with higher grades of gas. period

 

I thought I remembered that it burned slower as well.. I just didn't post on that cause I wasn't sure....

It may not backfire because of the slower flame front, or because the exhaust is a bit cooler and thus doesn't have the same capacities and densities etc that would lead ot the backfire... but that'd be about my best guess at this point.

 

I don't care what the stats are supposed to say, I only know what they do say. I know that I'm getting much better gas mileage while using 93. Should it work that way, I don't know. All I know about it is the way that it is working in my car. As far as draining your wallet faster... yes, I put more money in the tank with each visit to the gas station, BUT I end up saving money for each gallon (i.e. going 30 miles with premium is cheaper than going 30 with the cheap stuff)!

Like he said...

 

yo LDB - dont diss SHDotwn - he knows his **** unlike you obviously who doesnt so you just need to harrass someone or make a wise *** remark.

 

Actually... i thought LBD was dissing too... but if you read his post he is actually agreeing with me... but telling the others to put down their pipes I guess..

Using more tact/being nice in general is something good for this board though... but thanks for the support Mike

People getting better gas mileage.... if you are you are... you SHOULDN"T be .. but if you are you are... BUT there isn't any way you are getting more power... I just try hard to squelch that misconception that a lot of people have that putting in higher octane gets you more power because it really doesn't!

 

always thought they got ride of leaded gasoline because of toxicity of burning lead... like eating lead paint chips. Anyways even old cars dont need to run leaded (unless you want it to be original so its worth more). You can buy a kit to change out the necessary parts on most leaded engines to run unleaded gasoline.

 

Yeah they did get rid of it because of that... and because it doesn't like catalytic converters... And you are correct on the conversion kits as well! .

 

Have any of you actually documented better gas mileage with the 91/93 octane over 87? It's strange to me, because when I had my Camaro, it got 26-28 mpg on 87 and only 24-26 mpg on 92. Not that I'm disagreeing with you. The stats don't say anything about mpg related to octane, which lead me to believe it wouldn't change, or at least not much. I know that 100 octane gets terrible mpg, but maybe that's because people only put it in before they go racing and stomp on the gas. So I'm wondering how many mpg you gain from using Premium?