If you were willing to pay fives times the cost of a Focus, then I'm sure Ford could provide an engine inthe same body at that much higher price that would be able to get 50mph on the highway.
I wouldn't have a POS Focus or any other small thing they try to call a car at any price, even if it was free.
Personally, I drive a 1965 Chevy PU with over a million miles on it and I wouldn't trade it straight across for a brand new one.