Trouble with Gas gauge in 96 Escort ?

I was wondering if anyone has had trouble with this? The gauge seems to drift a lot upon acceleration and deceleration. I thought that newer cars
didn't have the bobber type of gauges. Is the gauge in the fuel pump? My girlfriend had a 98 and it didn't seem to do that. I am wondering if that is why my MPG seems so low, the car runs very well with 92,000.
Thanks in advance
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