Change your fuel filter they should be replaced every year that may have some junk in it and be the culpret

 

I got 100 more miles a tank out of a five dollare fuel filter.

 

The difference between driving 60 mph and 80-90 mph is 28+ mpg down to 22 mpg on my 1.8T.

If there were just some way to get the A8's adaptive cruise control into mine, I could get some sleep on those long highway drives I do.