I believe AH does model asymetrical thrust.
Fuel economy is affected by throttle and RPM settings.
This has been discussed before, but one reason to throttle back would be to model some limit on MIL power operation. I know some planes had 15 minute limits for MIL power, but I don't know the consequences of running over the limit. Overheating? Engine damage? It's probably a combination of variable effects, and might be too big a can-o-worms to model.
popeye