Matching EPA Type to My Car

[DastardlyDan]

I'm having trouble matching the correct EPA type to my cars. Specifically, there are multiple engine types for my model of car.

As far as my cars go:

Ashley's Vulcan: 2001 Ford Taurus SES, 3.0 Vulcan Engine
EPA Engine Choices: 6 cyl, 3.0 L 3.0 -or- 6 cyl, 3.0 L 3.0M
What are the differences between these two engines?

Dan's Duratec: 2000 Ford Taurus SE, 3.0 24 Valve DOHC Duratec Engine
EPA Engine Choices: 6 cyl, 3.0 L 3.0F -or- 6 cyl, 3.0 L 3.0L 2V -or- 6 cyl, 3.0 L 4V
What are the differences between these three engines?

In each case, how do I tell which one my car is? In both cases, they are Regular Gas Sedans.