what kind fuel you would use in 2.0T

[lucio_liu]

I use Chevron 87/89 most of time, 80% is city driving

[AudiDTMA4]

91+

Like the cap & manual indicate

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[stereojorge]

Shell 93 V-Power NiTRO+ only for me :)


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[hc_TK]

gasoline, i would never use diesel.

[zcd2.7t]

I use Chevron 87/89 most of time, 80% is city driving

Why wouldn't you use the manufacturer-recommended 91 octane?

Please don't say that you're trying to save money, because if that were the case, you wouldn't have bought an Audi in the first place...

[Irish1004]

Why wouldn't you use the manufacturer-recommended 91 octane?

Please don't say that you're trying to save money, because if that were the case, you wouldn't have bought an Audi in the first place...

My wife has a 2014 Q5 2.0 that we regularly put BP 93 in. On a recent trip we were only able to get BP 91 and we saw a big drop in performance. So much so that we couldn't wait to burn off that tank full and put 93 back in. Based on our experience I couldn't imagine what a pig a 2.0T would be not to mention the potential harm 87 might do. False economy in my book!

[riceboy22]

My wife has a 2014 Q5 2.0 that we regularly put BP 93 in. On a recent trip we were only able to get BP 91 and we saw a big drop in performance. So much so that we couldn't wait to burn off that tank full and put 93 back in. Based on our experience I couldn't imagine what a pig a 2.0T would be not to mention the potential harm 87 might do. False economy in my book!

I've recently discovered that BP fuel (by me at least) is crap. I was doing some logging and noticed that with BP 93 I was getting knock detection/timing pull of at least a few degrees whereas a full tank of Sunoco 93 showed almost no timing pull. I guess that's why the BP by me is $0.30+ cheaper per gallon!

[zachf88]

Costco/ Turkey Hill/ Sinclair 91. It's all the same crap. Just use a Top Tier fuel and min 91 octane.

*Highest we have in CO is 91 due to altitude.

lower octane is actually more volatile than higher octane. You get less combustion with higher octane. It allows the piston to travel the maximum distance in the cylinder before the fuel ignites, offering more power (longer stroke). Other than that, all octanes are the same pretty much.

[LINDW4LL]

Olive oil for me.

[LINDW4LL]

I use Chevron 87/89 most of time, 80% is city driving

In all seriousness, running 87/89 is a poor decision and will result in significant timing pull due to knock, reduced fuel efficiency, and a slower car, all of which are not good things. There's a reason Audi requires a minimum of 91 octane for your Q5.

[emceus]

My wife has a 2014 Q5 2.0 that we regularly put BP 93 in. On a recent trip we were only able to get BP 91 and we saw a big drop in performance. So much so that we couldn't wait to burn off that tank full and put 93 back in. Based on our experience I couldn't imagine what a pig a 2.0T would be not to mention the potential harm 87 might do. False economy in my book!

So true you can really tell a difference between 93 and 87
I use shell V-power 93 all the time even when the gas prices suck


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[goblues38]

boosted (turbo or supercharged) motors require premium.

Normally aspirated do not.

yes, you can use cheap gas in a boosted car, but it will be down on power 10% at least. In the long run, this will cost you any fuel economy you hope to gain.

[BG SQ5]

Someone should take your keys away if you're running 87/89 in a FI engine. That's ridiculous.


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[PreciseD]

Someone should take your keys away if you're running 87/89 in a FI engine. That's ridiculous.


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THIS

[lucio_liu]

boosted (turbo or supercharged) motors require premium.

Normally aspirated do not.

yes, you can use cheap gas in a boosted car, but it will be down on power 10% at least. In the long run, this will cost you any fuel economy you hope to gain.

will switch to 91+ in the future.

- - - Updated - - -

Why wouldn't you use the manufacturer-recommended 91 octane?

Please don't say that you're trying to save money, because if that were the case, you wouldn't have bought an Audi in the first place...

yeah trying to save money. i am cheap.

[lucio_liu]

Someone should take your keys away if you're running 87/89 in a FI engine. That's ridiculous.


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wife's daily commuter. she cant drive fast less than 10 miles roundtrip many traffic lights

[TexasDfwS4]

the ping factor is the killer. low octane burns hotter and faster so using 91+ will save your engine.

[lucio_liu]

the ping factor is the killer. low octane burns hotter and faster so using 91+ will save your engine.

70c more than regular here in Houston. but wife only drive less than 3000 miles per year so I can afford.

[Fourpoint282]

Pay the extra $5 in gas and get 93o anytime you can. You'll have better performance and your motor will last longer;)


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[BlackSVT]

wife's daily commuter. she cant drive fast less than 10 miles roundtrip many traffic lights

That's kind of reverse though of how I think about this whole topic -- If you will be doing nothing but straight-up cruising on the highway, even at 80mph+, you could probably get away with lower octane without much trouble because A) you're never in boost, or very slightly, B) you aren't asking for much in the way of power. Detonation will just be less of an issue. Look at MPG of a 2.0T on straight-away, flat highway cruising. Pretty good, right? It's because you don't need to make any power... ie you aren't demanding boost...ie who cares about octane (within reason)

Acceleration and transient conditions are where you demand much more from the engine, and you'll be dipping into boost to get going at every light. Face it, these things weigh 44-4500lbs with a little 4 cyl. You need that turbo to make them driveable in that kind of stop light to stop light commute. You see it in the garbage MPG you get on the 2.0T in that kind of driving. More power demand means you need the octane to avoid timing pull. With too low octane, you naturally step on it even harder to get going because it's not making the power you want at that moment. It's essentially false economy to run cheaper gas when more is being used for the same drivability. Just my rambling $0.02

[AudiDTMA4]

[stereojorge]

[Fourpoint282]

Hilarious....and exactly my reaction. Nice!


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[Wilbur]

ECU compensates for lower Octane. Probably wont cause any harm unless constantly accelerating hard . My Brother has about 160,000 kms (100,000 miles) on his A5 with 2.0 and has never run a drop of anything more than regular and has never had a problem of any sort. Could be down a few HP but nobody is going to miss/notice 5-10 on the street. These monthly fuel threads are funny. That being said , I always run what manufacturer reccomends. They have no reason to suggest premium fuel id its not necessary.

[AudiDTMA4]

ECU compensates for lower Octane. Probably wont cause any harm unless constantly accelerating hard . My Brother has about 160,000 kms (100,000 miles) on his A5 with 2.0 and has never run a drop of anything more than regular and has never had a problem of any sort. Could be down a few HP but nobody is going to miss/notice 5-10 on the street. These monthly fuel threads are funny. That being said , I always run what manufacturer reccomends. They have no reason to suggest premium fuel id its not necessary.

Here's the thing though......you're saving like $300 to $400 a year (so less than a monthly payment, 1-1.5 tires, 2-3 oil changes etc....). Just get a Corolla or Civic at that point.

[Perry01]

If you paid for 220 HP why not get your money's worth and use premium gas?

[PreciseD]

No one is mentioning that lower tier/octane fuels do not burn as clean and you will actually have more buildup than if you ran higher tier/octane fuel. In the long run you are going to spend more on repairs/maintenance than the savings at the pump...

[m47thew]

Go with leaded gasoline


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[sean_entrust]

92 only

[ryanherr]

can you even get that anywhere?

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[mirekmal]

Interesting explanation of your dilemma: https://www.youtube.com/watch?v=WYlk9C1o0nk

[rmaccara]

Nice explanation! I use 91.

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[Wilbur]

Here's the thing though......you're saving like $300 to $400 a year (so less than a monthly payment, 1-1.5 tires, 2-3 oil changes etc....). Just get a Corolla or Civic at that point.

I agree 100%. Just telling you that it doesnt cause any damage . I use 91-93 in my SQ.

If you paid for 220 HP why not get your money's worth and use premium gas?

Agreed. Brother isnt a car guy and clearly hasn't done the math.

No one is mentioning that lower tier/octane fuels do not burn as clean and you will actually have more buildup than if you ran higher tier/octane fuel. In the long run you are going to spend more on repairs/maintenance than the savings at the pump...

Because thats not true. Detergents determine how "clean" a fuel is. Octane is basically about how much fuel can be compressed before it ignites....higher the octane the less likely it is to ignite early ("ping"). Higher octane fuel burns in a more controlled fashion than lower.

[PreciseD]

Because thats not true. Detergents determine how "clean" a fuel is. Octane is basically about how much fuel can be compressed before it ignites....higher the octane the less likely it is to ignite early ("ping"). Higher octane fuel burns in a more controlled fashion than lower.

That is why I said Tier/Octane...

Lower tier fuels do not have the same detergents that higher tiers do.. and higher octane fuels are refined more than lower ones... That makes it a cleaner product...

[Wilbur]

Here's the thing though......you're saving like $300 to $400 a year (so less than a monthly payment, 1-1.5 tires, 2-3 oil changes etc....). Just get a Corolla or Civic at that point.

If you paid for 220 HP why not get your money's worth and use premium gas?

That is why I said Tier/Octane...

Lower tier fuels do not have the same detergents that higher tiers do.. and higher octane fuels are refined more than lower ones... That makes it a cleaner product...

higher Octane level does not make it a cleaner product.

[PreciseD]

Its not a cleaner product

My experience with petrochemical plants and their processes would disagree...

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[AudiDTMA4]

I agree 100%. Just telling you that it doesnt cause any damage . I use 91-93 in my SQ.

Correct, shouldn't assuming Audi's calibration team did extended 87/89 testing and the knock sensor is working correctly.

I'd just feel like a dope putting 87 in a car designed for 91+.....

[Wilbur]

I agree. If I wasnt prepared to run what owners manual said I wouldnt buy the car. Doesn't make sense to me.

[AudiDTMA4]

I agree. If I wasnt prepared to run what owners manual said I wouldnt buy the car. Doesn't make sense to me.

Same thing as people who get $99 tires for their $60K car.

[lucio_liu]

I agree. If I wasnt prepared to run what owners manual said I wouldnt buy the car. Doesn't make sense to me.

owner's manual was kinda vague, says don't put below 87. I would prefer they put 91 required not recommand.