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I'm everyone's been asked this question at least once. But seeing as how most engines made in the past decade are engineered to take both even though a lot of them recommend using only premium. So whats your 2 cents about about this topic?
 

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Regular, premium is only necessary if you are running high compression or forced induction. The reason to run premium is to prevent detonation/knock. Our cars aren't timed in a way to require premium and don't believe anyone who tells you you'll get better mileage running premium.
 

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Just go with whatever the manufacturer recommends. They always have actual data to back up their recommendation. Its not like they have a stake in the gas companies. If that was the case then every manufacturer would only recommend premium.
 

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regular is fine as stated above..we have 94 octane premium up here and its very expensive i only run premium in my harley
 

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I have heard that premium can actually hurt your performance if the car isn't tuned for it or required by the manufacturer. For instance high compression, FI or advanced timing will usually require a higher octane rating.
 

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I would just use premium. Not because people say you get better mileage. Not because people say it makes it run faster. But mainly because most premium gases don't have ethanol mixed in. Also premium gases can remain stable in your tank way longer than regular gas. Meaning if ever for some reason you're unable to start it up for a long time it wont gunk up the fuel lines.
 

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All gasolines have ethanol mixed in, at least here in the US, all the stations here have been converted, whenever I came across a station without ethanol mixed in I'd drive to it to refill, but, I haven't seen one in a long time.
 

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All gasolines have ethanol mixed in, at least here in the US, all the stations here have been converted, whenever I came across a station without ethanol mixed in I'd drive to it to refill, but, I haven't seen one in a long time.
soory that is wrong there is lots of stations all over the states and canada that are ethanol free ..ethanol is SATANS go juice lol avoid at all cost.heres a link to a list of staions just click on your state and up comes a list of ethanol free stations
http://pure-gas.org/index.jsp?stateprov=WA
 

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I would just use premium. Not because people say you get better mileage. Not because people say it makes it run faster. But mainly because most premium gases don't have ethanol mixed in. Also premium gases can remain stable in your tank way longer than regular gas. Meaning if ever for some reason you're unable to start it up for a long time it wont gunk up the fuel lines.

sorry thats wrong all gas goes bad in time period thats why there is fuel stabilizers..premium is the worse for going bad because of todays prices the fuel is sitting in tank longer and going bad as a result.up here every couple months premium sells for same as regular just to get rid of old stock..gas is gas some has more octane but all have same problem short shelf life or in theis case short tank life
 

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My gf and i did a test on our Yaris where we would fill the tanks with 87 or 91 and see if there were any differences in overall MPG.

We do realize that in order for a test to be 100% accurate that we would have to drive the same and take the same routes at the same speed and the same accelerations and stuff all the time.

The yaris was modded I/H/E, are most to note and the way i drive is pretty consistent. Call it biased, call it all in my head or that we drove differently BUT, with 87 we were running between 32-34 mpg average. On 89 we ran 34-37 average. On 91 we ran 36-39 mpg average.

We did this over about 6 months where we filled up 50-60 times overall. My thought is basically that since higher octanes help resist predet which is why it's favored in F/I cars and high compression cars it also burns cleaner under normal circumstances so you get better fuel economy out of it.

With that said, I haven't filled my 2 with premium yet, I'm too frugal and too chinese(penny pincher) to feel the need to pay an extra dollar or 2 per fill up to see if i get better gas mileage. BUT i've been able to reach our higher mark of 35 mpg but i've also been able to reach the lower mark of 29 mpg when i floored it everywhere on regular 87 gas. I average 33mpg overall in my fuel ups so far.
 

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Filling your Mazda2 with anything other than regular is simply a waste of money. The car does not require high octane fuel and any increases in fuel mileage will easily be offset by the increase in costs.

At least in the US, all fuels contain ethanol regardless of their rating.
 

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Filling your Mazda2 with anything other than regular is simply a waste of money. The car does not require high octane fuel and any increases in fuel mileage will easily be offset by the increase in costs.

At least in the US, all fuels contain ethanol regardless of their rating.
you are not reading the thread just the last post right..read post #8 i put the same link there..all chevron 94octane is ethanol free period..
there is many stations in the US and canada that sell ethanol free gas you just have to know where to go.
http://pure-gas.org/index.jsp?stateprov=WA
 

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"It will not make any difference. You can go back and forth between the fuel types, you can mix it without any issues. Unless the manufacturer specs rule premium fuel, usually for higher compression motors or for cylinder coating, it doesn’t make any difference.
I don’t think you will see any power increase that is noticeable. Just take good care of your car’s engine and if you still have any issues, I would suggest you to visit http://www.hiperformer.com/automotive/, it’s a very good resource and you would really enjoy it. "
 

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I am using 87 as well and getting 33-34mpg so far.

I would have to see my average go up to at least 36-37 mpg to make the switch to the next higher octane IF i were to reap any $$ savings in switching.

Generally it is said that 87 has more energy content that 89 or 91. HOWEVER, if your car is retarding the timing to use 87 then you are giving up some of that energy to inefficiency. Using a higher octane than what you car calls for generally wont provide any improvements unless your car was retarding the timing to prevent knock with the lower octane.
 
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