Will it be better to use Premium gas instead of regular during the break in period?

 

No

 

During "breakin" it is best to follow the manual. Period.

Save your pennies, (quarters these days) and leave prem. gas to cars that have the unfortuate luck to have stickers that read " PREMIUM UNLEADED ONLY"

 

i'll never understand why people think premium fuel is better for their car when they should run regular.

 

I think you should use diesel... It will keep the shneezer bearings from deseating during the breakin!

 

Seriously. Like its a special potion that makes everything better.

 

doesn't premium fuel have a higher octane so its to burn...so wouldn't dat be better for the car after break in..... :?

 

Absolutely not, and it could POSSIBLY damage your engine or HURT fuel economy. Realisitically you probably won't hurt your car, but you will definitely NOT see ANY benefits no matter what ANYONE says. Your car asks for premium for a reason.

I might have a few variables mixed up, but the idea is right. . . as anybody who has conducted a SCIENTIFIC study on it
Octane is added to prevent detonation (knock). Basically the same thing result as the fuel running lean. If the fuel runs rich it detonates late, possibly giving you engine ping. Anyway you can change these variables by adjusting the air/fuel mixture (what the ECU does) or by adjusting your octane. Now some cars require high octanes because their engines will knock if they use low octane. The ECU can compensate some, but eventually the engine will knock, as it can only do so much. Cars that require regular, however, have ECU's mapped and designed to work with regular. Using premium, your ECU may not be able to adjust the combination correctly, resulting in inefficient use of fuel(too little meaning you have to use more throttle and more gas and higher RPM in general or too much which isn't burned and completely lost, which one is which I don't know but both are bad). In previous days, there was differential treatment in the fuels, most of which has changed. Shell is still notorious for bad quality fuels that lead to knock in low octane fuels because of crappy management, but the other oil companies don't do this.
The reason you pay more for premium, is because it is more expensive to make, not because it is a better product. There are plenty of studies on this, and even the oil companies will tell you too. . . and to anybody who knows what I'm talkin about with all that stuff up there, I'm not a professional, so some exact details may be off, but the point is still 100% correct without question.

Take this analogy. . . summer tires have better grip right? So if you use high octane idiot logic, it would mean that they would be even better in the snow, giving you more traction. Hahahah try it I dare you! Summer tires are designed for summer, snow tires for snow. Snow tires cost more too! So on the whole cost idea, that would mean snow tires would be better no matter what. Try driving snow tires on a race track instead of regular or sport tires. Again I dare you, and give somebody a camera. I hope you understand by now, if not then I give up. It won't affect me either way, but I highly recommend you do some qualified research. . . don't take advice from some gooney eyed dog face, but get the results from a traditional study. There was one done a few years ago that I found in Car and Driver, which changed my attitude and enlightened me. They showed a consistent LOSS in mpg using premium in cars that asked for regular, and came to the same conclusions reviewing all data about the different fuels.

 

So what is the minimun octaine rating for the tC?

 

higher octane doesn't help the gasoline burn better. it's to handle compression better. using regular gas in high compression engines (forced induction engines) is bad because the the gasoline might explode because of the pressure instead of the spark. tC engines are low compression so it doesn't need the higher octane benefits.

you will NOT get better gas mileage using higher octane. you will NOT run your engine "cleaner" using higher octane (all gas has same detergents).

USE regular and save money.

 

thanx 4 clearing up my confusion....i have been corrected....so the higher octane fuels r better in cars dat use force induction cause of the higher presser cause the higher octane r least likely to detonate early due to pressure instead of exploding cause of the spark plug....right....i think well i don't kno....

 

This type of post comes up on every single car forum ive been on !- NO it wont help!!

That and " how much money to change my auto transmission to a manual transmission" comes up all the time - and - Your better off trading it in, and buying a manual transmission!!-

Im done ranting now...

 

absolutely correct!

 

o aight.....i think the toyota V6 (3.3l) the 1 in the sienna and the new solora use premium fuel can any1 explain y?

 

djct_watt
you're close...

2JZ
dead on ***** accurate...

octane is the percentage of the fuel that is based on eight based carbon chains... get it... Octane... Octet... Octopus... 8.... the other 13(87) or 11(89) or 9(91) or 7(93) percent is based on lower life forms... ok, that's the liquor talking ... but seriously it is based on the lower carbon chains... heptane 7, hexane 6, pentane 5, windowpane umm... etc...

it used to be a measure of the exact formula of the fuel, but the oil guys went and got smart and figured out how to give you less octane but maintain the performance... so today we are looking at the equivalent octane of the fuel... so now a 93 octane is STABLE for a performance engine... and an 87 octane is STABLE enough for your gas sipper... will higher octane make your car any faster... of course not... so every urban legend you ever heard about some idiot putting 120 octane from the airport in his car and leaving burnouts for 2 miles was all a lie...

ah hah... so you caught me... the 120 octane... how are you supposed to get more than 100 percent.... well easy... if you consider that it is possible for fuel to be more STABLE than pure octanes... so in a normally aspirated (not supercharged or turbocharged) car, you can run like 13:1 compression on a great day... there are so many factors that most car manufacturers top out around 11:1... the Honda S2000 comes to mind... well to get more than 100 means you would have to use a different fuel... ever hear of Nitro Methane... well you just can't be a real redneck otherwise....

anyway... hope this answers some questions...

btw... compression is the final stage that a cylinder goes through before the spark plug makes the horsepower come to life... the fuel and air mixture has entered and needs to be compacted so that the power can be extracted... a supercharger / turbocharger allows the engine to "pre" compress some air before it enters the cylinder... compression makes heat... heat is the enemy... so the sc/tc setup is to precompress the air and then cool it (aftercooler, often wrongfully called an intercooler)... then into the engine to be ignited... gasoline self-ignites (detonates) at around 1200 to 1300 degrees... so if you are close to that temp, engine management (the ecu) will retard the spark if it detects pinging (europe calls it pinking) to make the engine run cooler - therefore requiring you to use stable fuel to keep it running stable...

make sense??

(side note... an aftercooler is the air to air heat exchanger that comes after a compressor but before the engine on a forced induction engine, in some constant rpm setups they use a two stage compression setup that actually has a supercharger AND a turbocharger on the same engine.. the air is compressed by one... intercooled... compressed by the second... aftercooled and finally fed to the engine... people have taken the names and used them interchangeably... I guess I need to let this one go... )

 

Jesus Im never buying premium again.

 

I think a lot of people fall into the trap that more $ = better quality. Look at half the posts on this website comparing the tC to other more expensive cars. It's a consumer mindset, so we have to excuse people (including ourselves sometimes) for thinking this way.

I also long believed premium fuel was better for a car than regular, mainly because no one could ever persuade me that it wasn't. Playing devil's advocate again, why is there noticably better acceleration when you use higher octane fuel than when you use regular? That's one of the reasons I prefer to use it (although nowadays, I only stick to midgrade).

 

Ok here's my question......... should i run out my first tank of gas i got in the car before puttin more in to prevent mixing different fuel types? i've heard thats not always good for the car and really dont wanna do that with a brand new car if that's the case!

 

I also wondered this myself. Is it bad to mix different gas? especially in a new car?

 

Mix fuels? You should only be running gasoline. If your talking about mixing octanes, then thats also pointsless. If your talking about mixing brands of gas, who cares.

The lowest octane that will no ping will give you the best peformance. Higher octane burners slower and will actually hurt performance if not needed.

Some cars run premium because they have higher compression or more advanced ignition timing.