Some info from Ford:
Alternative Fuel Capability
Alternative fuel options with the 3.7L Ti-VCT V6
CNG/LPG Gaseous Engine Prep Package* for power conversion to compressed natural gas (CNG) or liquid propane gas (LPG)
E85 flex-fuel capability for running on unleaded gasoline, E85 (up to 85% ethanol and 15% gasoline), or any mix of the two
*Vehicle will be equipped with the standard factory gasoline fuel system. This package does not include CNG/LPG fuel tanks, lines, etc.
The 3.7L Ti-VCT V6 delivers excellent efficiency along with responsive performance. Twin independent variable cam timing (Ti-VCT) technology is an advanced-design feature of the 3.7L. Ti-VCT allows for variable control of the intake and exhaust camshafts, optimizing combustion at full load to increase power and low-speed torque. It also enables variable valve overlap, which enhances efficiency and improves cold-start operation with lower exhaust emissions. The 3.7L is E85 flex- fuel capable. And a CNG/LPG Gaseous Engine Prep Package for power conversion to compressed natural gas (CNG) or liquid propane gas (LPG) is available.
The responsive 3.7L Ti-VCT V6 is flex-fuel capable, so you can run on unleaded gasoline, E85 (up to 85% ethanol and 15% gasoline), or any mix of the two. Fuel injection and spark timing are adjusted according to the blend detected by electronic sensors.