well it wont be all that great in winter since its a RWD car...
reliability is good, it is nissans flagship car afterall, but remember that 92 would be 16yrs old so you gotta take care of it
gas mileage will depend on how you drive and maintain the vehicle, the more you boost the more gas it will consume
if you get alot of snow in winter or ice, then maybe look at a GTR
or if thats not in your budget a GTS-4 which is an RB20DET but is still awd and uses the same suspension and traction control as the GTR, it just has 200less hp