Even though it creates some confusion and make the mileage rating look unimpressive, I like the new EPA tests. They should be much more representative of what people actually get.
My GMC truck has a 2.8L engine, and it is rated on the old system at 19/23. Frankly it never gets that kind of mileage unless I use premium and then only if you are driving on the interstate at 65 or less. It really averages around 15mpg. My guess is under the new guidelines it would test at closer to the 15mpg.