Most hybrids with a larger battery (as this one) also have a charging port. I think what they do is start the test with a fully charged battery and never count

Most hybrids with a larger battery (as this one) also have a charging port. I think what they do is start the test with a fully charged battery and never count the energy in that. So you get the first 40 miles or so free until the motor kicks in to recharge the battery again (which is where they then start counting the gasoline consumed).