I would think the only way you'll get 100% premium is if you let your car run out of gas and then fill up with premium. Kind of a dumb question if you ask me (sorry, just being honest). If you have 1/8 of a tank left and fill up with premium, you get 7/8 premium and 1/8 regular. If you have 7/8 of a tank left and fill up with premium, you get 1/8 premium and 7/8 regular.

Will the fact that your premium fill-up isn't 100% premium change your habit of filling it up with premium once a month?

My suggestion is to fill up with premium all the time. You'll get better gas mileage - almost enough to offset the increased cost of the premium gas. There are plenty of other threads on this forum that talk about the fact that turbo cars perform better with premium fuel.

This car is designed to run with regular, but if I were you, I'd quit worrying about if you're at 87, 88, 89, 90, 91, 92, or 93 octane and just get premium all the time.

 

got it! I mean I would do all prem but I've heard mixed reviews on them and if it really works or not for the turbo in terms of mileage and if it's worth that everytime I do a fill up (since gas is so mad expensive) but I guess the only real way to see is if I did it myself.

 

If you are going by cost alone, the increase in gas mileage (mine went up about 2 MPG) doesn't completely net out the increase cost of premium. However, my personal take on this is I'm OK spending a bit more knowing I'm running premium through. Using premium also means you don't have to run the cleaner (like Chevron Techron) through at regular intervals.

And people will probably say you don't have to use Techron but the manual does recommend it if you aren't using premium fuel.

 

U only have to run a bottle of Techron every oil change if u aren't running a premium brand (top-tier) of fuel, like Chevron, Shell, etc. The octane u use doesn't matter in that aspect, as every grade has the additive in it. if ur getting your gas from little mom-and-pop stores and little convenience stores that don't have a name-brand gas, then u have to use the Techron bottle. Personally I only use Chevron or Shell 93 octane, as I believe the car runs better on the higher octanve and will be safer for the engine in the long run. It is a fairly high-compression turbocharged engine after all.

 

When my spark plugs were changed and my fuel system cleaned they tested my gas and told me to buy better gas... I had just filled up at Shell.

 

But where had you filled up all the times prior to Shell? I would think they are speaking to all the times prior that added up, not just your most recent fill-up...

 

I am prob going to get a bunch of comments but I have several friends that owns gas stations and they always told me that all gas comes from the same refineries. just that brand name companies add their own additives and detergents. Happy gas gets their gas from various distributors which can come from brand name places as well.
but the takeaway is to find what works best for u and stick with it.

 

Only use a higher octane gas if your car calls for it, typically only high performance vehicles require high end octane gas.
In Canada, detergent and additive levels are regulated by the government and are the same in all grade of gasoline. If your vehicle doesn't call for a higher grade gas, then it should have very little to no effect on it. Your best bet is to always use the same grade gas in you car unless problems arise (specifically "knocking"), and always have your routine maintenance service checks done on time.
I personally only use regular gas, always have.
Never use a lower octane gas than your vehicle calls for!

 

Lots of info on the forum that explains why premium is better in the 2.0T for certain applications.

:beathorse:

 

:beathorse:

+1!

 

Unfortunately I don't have shell or Chev in my area so I use Mobil 93 Oct. This is just has good correct? It's mad expensive haha.

 

If the RPM would change to shifting at redline and increase the boost in the lower gears I guess I could become more excited. I have ethanol free gas available and 87 works well.

I tried a half n half of 89 E free w/Shell 93 E and the car ran better. However there's quite a jump in price on the 89 from 87 along w/93.

Not to beat a dead horse, but if this car had a limited slip and would run until redline before shifting, w/premium & boost turbo pressure in lower gear, would make a lot of difference.

W/100K powertrain warranty it's not in their best interest. It would be nice if they beefed up the powertrain a mite and incorporated ltd slip. Then they could easily program some extra RPM and lower gear boost triggered by more ignition advance if you choose to use a higher octane.

The premium doesn't seem to be worth the price for me and my driving, yet if I only had ethanol available then I might feel differently.

 

Premium vs. Regular Gas

Unless you like making the oil companies rich, if your car only needs regular, use regular. Higher octane gas resists detonation. It ignites slower. High compression engines have a problem with the fuel igniting before the spark plug fires. You get two explosions in the combustion chamber - One from the pressure and one from the plug. That is the only reason to use premium - you have a high compression engine!!!! Race cars use premium ( higher octane gas). You are not treating your car, you are treating the oil companies. There is no difference in the additives or don't you think the oil companies would be advertising such.