MfGI was looking at some Steyr motor specifications today (on the Steyr Motors website) and was surprised to see the Hummer under the list of Military applications.
"Hummer HMMWV M998 fitted with a Steyr M16 TCA HD motor".
I don't know whether this is a special model for export, or an internal vehicle that is used where Euro Emission Compliance is required but I'd be interested to hear more if anyone knows anything!
Steyr Motors webpage is at:
http://www.steyr-motors.com
...and the specific page about the Hummer is at:
http://www.steyr-motors.com/applications/a107.htm
Jacques