AgisA

When you are doing 80 mph the engine is revving at around 3100 rpm; are on boost then?
If you are you probably not get good mpg. At 70 mph you are probably off boost.

arU4ic

Speed actually isn't a good indicator of boost.

Its a combination of gas and RPM, if you push the gas peddle 10%, you probably won't instigate the turbo, but if you go 30% on the peddle, you probably would. For instance if you are on a upward grade or hill, the boost will kick in to keep your speed up.

AgisA

To confirm, if I am doing 80 mph on a level section of the freeway with cruise control then no boost?

arU4ic

Most likely, yes.

sailor99

Curious about what the boost gauge is reading?

arU4ic

Manifold air pressure most likely, although I think the newer ones measure internal boost pressure.

kdigital

2900 on the motor now. I'm feeling that same -sigh-

Love the car though. Mileage will likely improve I think.

arU4ic

So today I drove my old 2001 2.8 Q A4, AC on, with a 5 speed and got 25 mpg easily on my commute. Arg.

I know, I know, I'm adding 100 horsepower with the S3, but I would think if I'm not hitting that horsepower range by keeping the RPMs low I'd get 30 mpg easily on the S3.

I really hope more break-in will equal better MPGs. I know the break-in oil is pretty heavy but I have a hard time believing that I will suddenly break 30 mpg on the highway after my first service.

(yeah, I know, I know, I'm obsessing now… can't help it, gas is &$*#@ expensive in CA.)

Dr. Jekyll

I've been averaging 27 mpg on my daily commute (1/3 rural, 1/3 highway, 1/3 city - 35 miles each way). I had a 75 mile, all highway trip yesterday and averaged a little over 29 mpg. I didn't use cruise control and was around 70-75 mph the whole way. 1700 miles on the motor.

sailor99

I am curious what size wheels and tires you are running? Thanks.