Yeah, new tires are bad. For the EPA test, the tires have at least 3000 miles worth of wear on them. Rules limit them to 4000 miles.
The point of the tests is to allow a like to like comparison of different models, not provide you with what it will get on the road. There are too variables in the real world to account for that. Changes in temperature will change the fuel consumption, as will using the air conditioning.
The EPA does put the closest to real world on the window sticker. Check Fuelly's database, the average for most models is really close to the EPA combined figure.
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