i got about 300 to a tank when on the interstate the whole time...

around city it cant be more then 18mpg

 

I got between 15-18 with my streetported S5 n/a, unless i was driving it real hard. then about 12. at least it used regular fuel.

 

My best on the highway was 26.6 miles per gallon. Usually it is around 24 on the highway, I have not checked in town. On an 88 GXL Stock.

 

So I sould plan to get about 16-20 mpg. depening on the driving i do.

 

It will all depend on if it's a N/A or turbo and how you drive it. Mine is a TII and I drive it like I stole it, err I did before I blew an apex seal, and I was getting around 12-15 mpg in town and 19-22 on the hwy depending on how fast I was going.. 70mph - 90mph.

 

I get about 220-240 on almost a full tank... have not yet run it down to empty and dont plan to. I have never see the refill gas light.

edit: This is with about 70% city/ 30% highway (semi spirited driving and after I did a full tune up.)

 

right now with stock engine is my gas consumption around 12liters per 100km, mixed driving (city/highway)

 

I average about 22 MPG mix of city/highway. Best I ever got was 300 before I filled up and about 25 MPG from Tampa to Tallahassee. Car is stock, and I behave fairly well.