Demand for the Lincoln MKZ Hybrid is strong enough that Ford will change the production mix from 20 percent to 30 percent hybrids for the 2014 model year.

It's part of an overall MKZs comeback, which saw sales increase in April sales now that the car is no longer quite as slow to roll of the line. MKZ sales more than doubled last month, hitting the 4,000 units sold mark for the first time and setting an all-time monthly sales record for the Lincoln brand.

Ford is targeting younger customers for the MKZ. The MKZ is doing especially well in the coastal areas. Los Angeles is the fastest growth market where retail sales more than tripled, lead by the MKZ hybrid, said Ken Czubay, Ford vice president of US marketing, sales and service. In LA, the hybrid made up about 60 percent of MKZ retail sales.

With the exception of the Lincoln Navigator, the other members of the Lincoln family had a very poor sales month. The MKS plummeted 44 percent, the MKX dipped eight percent and the MKT dropped 31 percent.

The Ford brand did much better in April, with the F-Series pickup, Fusion sedan and Escape crossover each seeing impressive gains – and the Ford models sell much higher unit volumes than Lincolns do. The Taurus sedan, Flex crossover and Transit Connect were the only Ford models that dropped in sales during the month.

Back in October of last year, the Lincoln MKZ Hybrid was given a combined 45 miles per gallon rating. At that time, it was behind the Ford Fusion Hybrid's 47 mpg estimate. These days, that 45 mpg rating for the MKZ Hybrid is looking pretty darn good.