Yeah, I'm going to have to agree with those saying the EPA numbers are not practical unless you are a granny. The modern EPA numbers for turbos are pretty bogus. I have a Cruze with the I4 turbo and it was advertised as 40mpg, but only gets ~30 over the 100k that's been put on it which is nearly all highway. You can not use the turbo at all during acceleration or your fuel economy is nearly cut in half. Staying out of boost feels really bad, you know, like an NA I4 with a restricted exhaust system...
Then, I have a 2014 GMC Sierra with the V8. I've been getting exactly if not better than EPA ratings on it. The boosted cars and trucks are treated too nicely in the testing.
FWIW, I had a 135i that would cruise quite nicely out of boost, but it didn't get near 30mpg.