45mpg

Hi all. Works offered me a 350e estate.... I'm 99% going to do it. However my home to office trip is 180miles. All m5/m4. With a full charge at one end, will it average 45mpg on a motorway run at 70/75mph?

Had to do a round trip from Dundee->Glasgow->Edinburgh and then back to Dundee the other day and managed a collossal 45mpg! Never managed to get it that high before and was just wondering if anybody else manages to get this normally. It was a Friday and leaving Edinburgh at around 2pm i did get...