my experience in a new 2001 turbo jetta mpg was about 27 on trips to work mostly highway some stopping no real traffic hangups, from new mileage kept increasing until it maxed at 34 average, it took 10,000 miles to reach the peak mpg, so it will get better, also i highly recommend a top quality full synthetic such as red line or amsoil, turbos can get hot and the best oil is cheap insurance, i change mine every 10,000 miles or 1 yr, and have a happy not so stock 174,000 mile engine using maybe a qt between changes, prolly due to occasional 20 plus lb boost

 

I had the same situation with my 99,5 Jetta. Though not turbo ( vr6) I switched to synthetic, and yes it took that long for the mpgs to climb up.

 

My mpg is at @ 30.5mpg. I'd say 50/50 city-highway. I like it with the cruise engaged and the (Boost) gauge reads -8 in. Hg. (on the vacuum side) that is with the cruise set at 65 or at 85 mph. So I'm getting almost the same as I'm getting on my '04 Passat with the 1.8 turbo (31-32). And the SS has 90 more horsepower.
I can't wait until this car is broke in to see what kind of mileage I'll be getting.

 

My dash shows about 16mpg average normally! Got 24mpg average on the trip for the Tom's Farm meet and afterwards, that is the best I have seen.

 

My 09 SS is avg. about 29-30 on hwy miles and around 24-25 on traffic miles.. 700 miles so far..

 

i just turned 4k we have alot of hilly terrain around, but on a flat highway I'm around 35 mpg and on a flat country road, around 38mpg at about 40mph

 

I've found out that what the DIC reads isn't very accurate. Just divide gallons serviced at fill-up into amount of miles driven since last fill-up. On my first fill-up the DIC read @3-4mpg on the low side. I've also been resetting trip A with every trip and resetting trip B at each tank fill-up. That way the average mpg reading seems to be more accurate. Of course I have only filled up twice, so far.

 

I've found the same, the DIC is reporting better gas mileage than I am calculating recording from actual mileage driven and gas (Liters) consumed. Early for my analysis as well with just the two fill-ups.