A roof rack will drop your mileage by maybe 2 mpg, maybe another 1-2 mpg if you have a 2" lift all the time, still more mileage loss w/ bigger tires.
Rear locker is only available on 98-99 US LC and still availble on the '06-07 LC's outside of N. America. Center diff lock means power will be always split 50-50 between front & rear drive shafts. Rear diff lock means power is split 50-50 between each rear wheel. So with both center and rear locked, each rear gets 25% of the power, even if a front wheel loses traction (spinning wheel gets 100%, wheel w/ traction gets 0% for an open diff). With the '00+ LC, this is not the case. You can also lock the center diff in either high or low (on some LC's, you can do this; on others, you need to do the pin7 mod or else you can only lock up in 4wd low). The owners manual should say.
BTW, the display on the LX (at least the '03+) is probably brighter since the lights are all LED's. Also, no burned out bulbs to replace.
Rear locker is only available on 98-99 US LC and still availble on the '06-07 LC's outside of N. America. Center diff lock means power will be always split 50-50 between front & rear drive shafts. Rear diff lock means power is split 50-50 between each rear wheel. So with both center and rear locked, each rear gets 25% of the power, even if a front wheel loses traction (spinning wheel gets 100%, wheel w/ traction gets 0% for an open diff). With the '00+ LC, this is not the case. You can also lock the center diff in either high or low (on some LC's, you can do this; on others, you need to do the pin7 mod or else you can only lock up in 4wd low). The owners manual should say.
BTW, the display on the LX (at least the '03+) is probably brighter since the lights are all LED's. Also, no burned out bulbs to replace.