I have been filling up with 91, just saw in the manual that Justa can take 87.

ur thots?

TIA,

 

Any car can technically use 87, however using higher grade has will always be better in the long run, less engine problems and usually you well get better gas mileage with higher grade gas, which will discount the higher price for the gas. I put 91 in my s, for a justa I would put 89 or higher

 

my wife's 2008 justa owners manual (also next to the gas cap) says to put "premium", which surprised me. then I read the non-turbo N12 motor has a 11:1 compression ratio, which would necessitate higher octane. for a 1.6L that only makes 120HP, I don't think the engine needs to work that hard.

I reluctantly put premium (91) in her justa, not for performance, but as preventative maintenance.

 

I asked our dealer Saturday that very question and he still recommended premium. If you really need any more reasons to use premium over mid-grade or low-grade most places have ethanol free premium fuel and it ABSOLUTELY gets a noticeable fuel economy improvement.

 

thnx for the replies, i normally fill up at COSTCO, i will look out for places that have ethanol free premium fuel.

 

Gas stations like Costco and dams club use low quality fuels which is why they are lower priced. When it comes to gas you really do get what you pay for. Putting 87 Costco fuel compared to let's say 91 octane from shell has a drastic effect on the engine. And let's be honest here, how much do you really save on gas? A couple dollars probably. I filled up at SAMs club one time and two days later my engine knocked noticibly and that was using 91 from sams

 

I may be wrong, but I recall reading something about the inability for an engine to burn everything cleanly or an incomplete ignition or something causing buildups in the cylinders etc.

Use the lowest octane fuel that will preclude knocks in the engine is what I've always gone by on two wheels or four.

Cheers!

 

i had read somewhere that Costco fuel is actually a top brand fuel, but they cant advertise it. I will fill up the next few times at Chevron and see if i notice any difference.

 

Oh really? I only have experience with same club which is not a high quality brand and I figured Costco would be similar due to its club type membership like SAMs club
If you fill up with the same octane and you don't see a difference then good for you and I wish there was a Costco near me! Haha

 

Years ago, I had a neighbor who delivered gas and he said the Costco gas is the same as what he delivered to other stations. In fact he said the premium brands will often "buy" gas off each other. Granted this was years ago, but it may still apply, at least here in Ca.

 

interesting read from Car Talk forum

http://community.cartalk.com/discuss...her-gas-brands

"Costco's gas contains 5 times the detergent level that is required by The EPA"

http://www.costco.com/gasoline.html

I think I will stick with Costco

 

I've just been using premium. The difference is a cup of coffee and danish, it helps me lose weight. ;-)

 

A salesman (didn't buy from him) who appeared to know what he was talking about said something about not wanting to use ethanol because of the high compression engine as it exacerbates the carbon buildup problem. The claim passed my ******** detector, so I do it.

Like Amancuso, I figure the cost per tank isn't worth the risk. If you can't afford the odds beating you, don't try to beat the odds.

 

Costco and Sam's
Club are very different places. Very different.

 

One of my buddies (fellow turbo addict) works at Costco and says they get some high grade stuff.

 

that's good to hear

 

I use Costco and Chevron in my Clubman S and i don't notice any difference in performance. I just don't know if there is any difference in the detergents between the two. Anyone know?

 

It is possible I got a bad batch when I went to SAMs club, everyone on here believes there is no difference from brand to brand

 

I did the same with my bimmer, and didn't notice any difference too.

 

IIRC, my '12 Justa's manual says that 89 octane is the minimum, but that 91 is still recommended. I use 91.

You can't (at this point at least) get ethanol-free gas in California. Some states allow it, some do not. If I could find any, I would probably use it.

 

All of the different gas stations get good gas but they all have their own additives to cut the gas. So yes generally the cheaper the gas the cheaper the additives and the worse it will be on your motor.

 

Use 93.

Chad
Detroit Tuned.

 

MINI recommends using premium and top tier gasolines (toptier.com) for the best performance. The higher level of detergents and better filtering prevent injector and carbon builtup problems. The top tier premium gasoline is about 50 cents more per gallon than low grade regular gasoline. The ignition controls in the MINI can prevent pre ignition but at the expense of performance and gas mileage. Some low grade gasolines have over 10% ethanol which can cause failure of the high pressure fuel pump of the MCS. MINI will not cover the expense of replacing high pressure fuel pumps that are damaged by fuels with over 10% ethanol.

2011 MC PW/B

 

I never see 93. Highest I've seen is 91. Now that my Mini is here I'm going to have to pay more attention.

 

I've only used 93 on all the cars. The few emergency times I've had to use 87 it burns faster and loses power. I've yet to try anything lower than 93 on either MINI though.