Taqwus:
Hehe...yes, I already have more fuel efficient engines etc in my tech set. As it was, I just didnt see too much gain to going down the 'Propulsion' tech tree. It was handy once you got the speed bonus engines, but not that big of a deal IMO.
My tech set has the engines gradually becoming more efficient in supplies/use and in supplies carried. I also made the earlier engines more expensive so that the encouragement to improve the engines to save maintenance costs is there.
I hadnt thought of 'hardened engines' but that is a good thought. I might squeeze that in there somewhere too. Thanx!
Talenn