HAHAHA a unimog! That's awesome! Crazy awesome. And crazy
You could probably increase output and decrease EGTs by upping the injection timing (advance). The way I understand that is that it makes more of the fuel burn in the cylinder and less on the turbo so the EGTs are cooler but the cylinder temps will get a little hotter. Not sure how it would effect FE.
Make sure your injectors are in tip-top shape. I'm not sure how many miles (Km?) are on the stock sticks but with an old 70's diesel, I'm sure they could use some help. Pop-off testing will let you know what shape they are in.
Those recommendations are actually from plenty of lurking over at cumminsforum.com (2nd gen) researching MY diesel engine. If yours has indirect injection... well, I'm not sure.
Of course, you could also change the rear end ratio (like mentioned in that link there) but that may or may not be practical.
Keep us updated and let us know what its FE turns out to be "stock." Should be worth a good laugh
