Resource carryover, we need it!
Production, research
I've noticed that resources like production, research, and experience do not carry over their unused amounts when completing a project on to the next project. For example lets say a militia unit takes 300 production to build and your city is pumping out 200 production. The first turn the unit will still be in the queue with 200/300 production complete. The next turn the unit will be completed with 300/300 production with 100 left over and the next project assigned, to start at 0 production. What happened to the extra 100 production?
This also happens with research as well. All excess research is wasted upon tech completion and instantly disappears.
It is really discouraging resource maximization when you know that the more research, production, and exp you get in a single event, the more is wasted.
Resources should carry over to the next project when it is chosen. A city that has enough production to crank out 5 militia in 4 turns should be able to do just that, instead of the 5 turns it takes now without carryover. It is really noticeable in the endgame.