civic P20 VX/CX trannys compared to P20 EX/SI trannys? is there anything on the casing that you can identify that the gears are longer? i ive looked in to it a bit about them, and all i can find is people telling me just to Throw it in and find out??!!?? im trying to get the best MPG's.

also dose anyone have any suggestions about the gears i should use on a VX motor in a 93 4door lx? is the extra weight going hurt my MPG's?
i can build trannys so if any one has a good hybrid tranny gear setups let me know! thanks!!