What year did mercury come out with the 20hp EFI motor? Is a brand new 2017 Mercury 20hp purchased before 03/31/2019 still going to get the complete 5 year warranty that is offered on their new motors? In what year did Mercury add the new and genius tiller system? Does Tohatsu make the Mercury 20hp? Thanks for any and all help. I'm going to buy one or another of the above motors in the next ten days unless somebody talks me out of it. Tom