I recently purchased a 1993 Altima with a KA24DE 186k miles / auto trans. 30k miles and I'm just about finished repairing it (new timing parts, oil pump, water pump and cylinder head) and I want to modify it (while I'm in it) to get the best fuel efficiency I can out of it. A little extra performance out of it would be nice but that is not my main objective.

Can anybody give me some good suggestions? Thanks in advance!