Mileage does go down a bit in winter for the reasons others have noted, but that 's a pretty big drop.
Does it start ok? Does it idle/ run fine? Have you noticed a reduction of power or hesitation? Is it blowing smoke? If so what colour?
When was the last time you had a tune-up? Have a look at your air cleaner and pull a sparkplug and have a look. It could also be your plug wires, fuel filter, O2 sensor, ect. If that car has a distributor (probably does at that year, many of the new ones don't) you should also check your cap and rotor.
Lot of questions, but these are just some of the possibilities. With a good manual and some basic tools you can investigate most of these things yourself.
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