FuelEconomy.gov has published their ratings for the 90D and P90D. The 90D combined city/highway rating is listed as 100 MPGe with 95 MPGe for city and 106 MPGe for highway. EPA rated range is 270 miles. 34 kWh / 100 miles. The P90D combined city/highway rating is listed as 93 MPGe with 89 MPGe for city and 98 MPGe for highway. EPA rated range is 253 miles. 36 kWh / 100 miles. These are the exact same numbers they publish for the 85D and P85D....
About this, in almost all cases, the manufacturer is the one that does the EPA cycle test on their own and submits the numbers to the EPA.