Running Mep-806 on single phase

I have been given the opportunity to purchase a Mep-806b and would like to run it on single phase. How difficult is it to only pull two legs of power off these units? By doing this I will still have 120/208v and as long as all my 240v appliances are capable of running on 208v I should be fine? From my research it looks like my biggest issue will only be fuel consumption effencicy is that right?
Thank you