Draggin chit up from 3 pages back.. but that is me.

In my 01 tahoe i get the same kinds of results.

14 with 92, 18-19 with 87.

Now with my new 05 4.5 week old b6 3.0 It's a diffrent story.

I get about 26.5 ish with 92.

and about 23 with 89.

Your gunna say 4.5 weeks your motor is not even broke in you can't base the gas milage yet.

Using your same method i can. I now have 7000 miles in 4.5 weeks of ownership. I put in up to 4 tanks a week.

I watch my milage like a hawk sqeezing every drop i can.

 

to much octain can actualy have the same effect. Looking at is from a phisics and chemistry point of veiw, High octain, burns slower/hoter/longer, same spark timing = burn continuing after power stroke is finnished. just a waste. of energy.

 

No one even mentioned this yet, but sometimes the reason we don't want to pay more for something is not simply because we're trying to be cheap. At times, the incremental cost of better quality doesn't match the improvement to a service. It's the principle of not going along with something that's a rip-off. We feel that paying more for an Audi, we get commensurately higher value, but that's not the case with types of gas.

For decades, the "high-test" has been a lucrative bender for the gas stations. Ever since gas stations have been required to post their prices in big characters, their "come-on price" has been that of the regular gas. Why do you think Sunoco had their “Economy� (octane 86) gas? Once they got you in the door, they’d figure you’ll pay 10% extra for the other octane, to make it 87 octane gas!

The point is, my impression is we get something like 5% better performance (from premium gas), by paying 10% more! This is like paying 100% more for a Cadillac, to get a 50% better ride! Okay, okay, I know what you're going to say... "if you want to play the Scotsman, why don't you just buy a cheap Ford???"

 

For those that say it's ok to run 87 on a 1.8T because it's 9.0:1 compression, you need to remember that the turbocharger increases the effective compression of the engine. Turbo gasoline engines are low compression internally, because the turbocharger has a multiplicative effect on the effective compression of the engine.

The bottom line is, and it's been said before, you spent the extra money to buy an Audi; TREAT IT LIKE ONE. While the ECU will pull timing and cut boost, it will increase carbon build-up and decrease the life of the engine internals and turbocharger. The engine is designed to run on 91, why put anything else in? You wouldn't feed yourself dogfood

 

Even though you just know you're getting ripped off paying 30% more for normal food. For those of you that aren't gonna just take what Big Brother hands down, for those that can't fathom compromising their principles to line the pockets of Big, uh Food.


It's your car; you feed it whatever you want. If you really feel special for saving 3.00 on a tank of gas because it wasn't absolutely critical that you pay it, then I'm happy for you.

 

oops guess it wasnt quite that obvious to me. but sreiously though gerbal food and water and itll be running like a champ

 

It's not a 30% price difference, it's 8-10% depending on where you live. You aren't getting ripped off, you're getting a higher quality product. It costs more to produce high-test gasoline because it contains more chemical cleaning agents and a higher concentration of the potent portion of gasoline called octane. Premium gasoline requires more energy to combust, therefore does not suffer from pre-ignition problems (knocking or pinging). This isn't some kind of conspiracy pushed by proponents of BIG ENERGY. Put 87 octane in a high-HP turbocharged or high compression car tuned to run on 91 or 93 octane and see what happens. You'll have bits and pieces of engine all over the place with the quickness. Luckily for you guys running 87 the Audi engine management system will pull so much timing and cut boost so that you won't be stuck with a boat anchor in your engine bay, it will just have the acceleration of a 1993 Civic CX.

Your argument is that people put premium gas in their cars because of some kind of conspiracy. Well, you're wrong. The highest performance and SAFEST gas you can put in your 1.8T or 3.0 A4 is premium gasoline. It's not just some kind of conspiracy, it's fact. If you like your engine to not give you all the performance you purchased, than that's fine. If you want to decrease the life of your turbocharger and engine components, be my guest. It's your choice.

 

Speak for yourself.

 

So you saying that europe 98 is like 90-93 USA
then logical conclusion is that USA 89 is Europe 95

Well for my V6 its recomended and desined for europe 95 or USA 89.

In my taste:
I fuel when cold like 0C i use regular (87). engine warms up faster and performce beter in my taste. also I drive usually alone and unloaded w/max tire pressure. And No ditonation
when becomes hotter like 0-15C I switch to 89 octate same as when cold on 87
Then during summer I switch fully to premium 91 or 93 whuch ever I will find. same as before

On the Millage part I suck, I get 11MPG all year long. but only do city driving.
Under load it detonates with all fuel that are lower that premium.

On the note of fuels:
higher the octane number more energy it has. meaning 87 octane has less energy that 93 octane. but it depends on the desine of the engine to unlock the energy. Meaning if engine is desinged for 87 octane then if you put 93 octane the car will have less power and less MPG. but if you put low octane in high octane designed engine then you will have less performence and MPG.
That changes with outside temperature, just a bit. if its cold outside then fuel is a bit denser meaning has a bit more energy. air is denser meaning when its compresed, the Max heat of compresion will be less. its all adds up when you compare cold day to summer day. less heat + low octane equals to hot air + high octane.

dont get confused. also there is big diference between non oxydized fuel and oxydized fuel. I prefer non oxydized fuel, more power and less carbon build up. it burns cleaner and faster. thats why oil companies love to add etanol to it. they have to make lower octane fuel = cheap and just add magical orange/yellow "water" that looks like pie and voila they have high octane fuel. but the big diference is in how much energy each of them stores. obiously non oxydized fuel has a lot more.

so enjoy some info. :-)

 

I always run sunoco super 94. Its usually only a few pennies more than 91 so why not. Take care of your investment. Audi didnt tell you to run 91 in it for the f*ck of it, im sure they have engineers that make those type of decisions for good reason.