hotsaucePK

I'm using 64L (tank capacity) as the 'actual liters used'.
Since I haven't used the entire tank, I'm using 32L as my 'actual liters used' at the half way down mark.
It's not like engine oil where I can stick in a dipstick and measure the actual level...
Anyways, I'm happy with current consumption.

Speaking of engine oil, my attention is shifted to that now - I've burnt just under 0.5L after about 1100 km since oil change.
This doesn't seem good, although the manual says 0.5L per 1000 km is normal (how is that normal Audi...).
I'm going to take it in to the dealer when it's about 1/4 left and ask them to do a phase 1 consumption test.

hotsaucePK

Just wanted to inform those interested in my findings and conclude this thread.
I just did my 2nd fill up, it wasn't a complete fill up from the bottom but I did put in 48.75 liters.
My tripmeter showed 537 km since the last fill up.
(48.755/537) x 100 = 9.08 L / 100 Km.
It seems good

veriwide

That's about what I average.. what did your display say? mine would read higher..

bgpa4

Let me just resurrect this for a minute! I have filled my 09 A4Q Tip with 60L and 58L of supposed 91 octane Shell since owning it and both times have only gotten ~420km out of it. New MAF, upstream O2 sensor, air filter, cleaned intake valves, stage 2 done, N80 valve, checked the DV +N75, no boost leak and no codes in memory. Wastegate is tight and i drive like and old woman to see how far i can go!!! I'm pissed! How is this possible on an 80% Hwy commute?!

veriwide

I think that works out to 20 MPG (imperial). I am not sure what your car is, a sedan or SUV a Q? Anyways, either way, you need to drive properly for max MPG. That means no jackrabbit starts, very easy on the throttle always.. feathering the gas pedal. That means that when you reach your speed you ease off of the gas pedal and feather it.. it also means when coming to a stop or seeing a red light up ahead you lift off and coast. You have to really drive for the milage. It does not mean you have to drive like a sissy. You can still drive quickly and get good gas millage but only once you get up to speed.

I average about 28 miles to gallon with mt 2010 A4 Avant. My display shows an avrg over time off 9.1 but i know it reads 10% high and thus my figures.. BTW, I speed all of the time but I drive for economy.

Hope this helps... if you didn't already know. I learned about feathering by once driving a car with a owner installed vacum boost gage and you could really see the effect.

One more thing: NO Warming up the car in the winter.

bgpa4

09 A4Q Tip= 2009 A4 Quattro Tiptronic, but yes, it's a sedan. Trust me, I've been driving like a "Hyper Sissy" to see how much I can get out of it and it always comes out to around 12.5~13l/100km (or ~18mpg). I'll be running some logs with my VCDS to see if I can't find some values that are off. Perhaps point me to a bad MAP, IAT, MAF, O2, ECT or whatever else.

veriwide

What happens if you cruise at lets say 120 KPH for 15 minuites with the trip log reset? Surly you must be logging 7-9/100km then, No? Just trying to see were you are losing your KPG.. hywy, city or what?

bgpa4

I did switch to actual consumption for a while to see what it would say on the highway. And it does go down to around 9.9~10.1 if I hold my breath and barely feather the throttle to remain at a constant speed. On the trip1 screen, the average resets every morning and it always goes up to 20L/100 until I get to the highway, no boost, no traffic or lights. Two stop signs. 15mins hwy @120km/h and another 10min @ 50~70km/h to destination where it then shows 15.XL/100km. (roughly)

The thing that has me scratching my head, however, is how much I have to beat on it to get boost above 5psi. I'd have to try another B8 to know if it's just mine. IE: Driving aggressively will show 4~6PSI but the car is always upshifting as soon as possible. Boost is the same in sport mode as well. If I merge onto the highway and go around 3/4 throttle, I'll see 10psi for a short time. I'm wondering about the health of my turbo and/or N75 vale. The DV looks to be in good shape. Hence the need for some logging. I'm curious to see requested vs.actual boost. Then again, no codes present when I scan.

I think I will reset all adaptations and drive it the way I think it should be driven and see how far I get on a tank.

Lastly, gasoline over here is labeled as reg/plus/supreme with no numbers to be seen. Shell labels it as levels of cleanliness. I've asked attendants if they have any documentation handy that could show octane ratings and they all say "no but I have this flyer here about ethanol"...

boeing777yul

I have researched and read many articles regarding octane and I'm still puzzle by the fact that people think octane increase mileage. If it is not recommend by your manufacturer then it becomes none relevant. Also people need to take in account the price increased between both fuel. The ratio of price at the pump and the supposed milage increased, I did say supposed milage increased.

I also have done many comparison of my milage. My trip odometer has never been above 7.8l/100km since I got my car. I do 80% highway on the 401, so sometime there is a lot of stop and go.
By the way the milage I get is with 89 octane. My A4 2009, manual has been filed with 89 since I got it. The manual recommend 91 as a standard but there is also a not that 89 octane is the minimum octane rating. I have 63000km and I have no problem. The car has adjusted its timing due to the lower octane.
So in my opinion if you wish to save some money and you are driving in an economical way 89 octane should save you some money.
until I ear otherwise, my trip meter has been my best judge so far. 7.2L/100 on Highway to 7.8L/100 average with 63,000km logged on.

veriwide

Don't forget that the MM reading is probably low.. you will need to do an actual check to see what it really is. Mine reads about 10% low so that even though it shows 9.1 average it really us more like 10.1 which I still consider very good for a 3700 lb performance car!

The other person having a low gas millage must have something out of whack somewhere. I have no idea how to figure that one out.

As for octane.. well, the engineers who designed the car would prefer you use a higher octane fuel so that engine knock is not a problem. You may also have cleaner plugs and all due to better and more complete combustion. I know, the engine will adjust for it but in my opinion the extra $5.00 pr fill up for peace of mind is worth it.. besides, who buys an Audi Turbo for fuel economy?

Drive on!