I ALWAYS get better than EPA estimates. But, on automatic transmission cars, it don't get much better. Have a brand-spanking new Forester that we just got 24 city on first tankful, and just came back from an almost all highway trip averaging 29. It's rated 23/28. Drove all around 70 mph, top speed 82. Sat in traffic for 6 minutes (I timed it!) to go 0.4 miles once. Stopped twice to let the dog out and eat, and stopped at two different relative's houses. So, 29 is excellent.
On a Saab 9-2x (a Subaru Impreza wagon in better clothes), manual transmission, rated at (I think) 22-29, I've never gotten worse than 24. I only got worse than 30 HWY once, and that was in Florida averaging upper 80's, and hitting a traffic jam around Tampa for 30 minutes...I still got 29! I have gotten as high as 34. Usually set the speed control on about 76.
Other cars very similar...autos get higher, but just by a little, manuals get much better. And, people say I drive the manuals harder than most people...what they don't understand is that I DO accelerate briskly, but, I also use judicious amounts of speedy coasting combined with looking ahead at traffic patterns to minimize speed changes. To me, it's fun.