weird fuel readings

ok, i'm having some weird readings on my '01 gt.
when i first got it i filled it up right after the low fuel light came on. it filled up with about 11.5 gallons of gas.

whenever i fill up the tank, it will stay on FULL for a tiny bit and then go really quick. so far its reading that i've gone about 90 miles on half a tank.

now the weird part.
when it gets below half a tank, or even more so when its around 1/4 of a tank, the gauge starts going by a lot slower.

both full tanks i've ran, i've gotten about 22-23mpg driving about 280miles.

ok, if anyone can make that out, tell me what the problem could be.

40th GT said:

I wouldn't sweat it. I mean, it's better for the low fuel light to come on a little earlier than too late, right?

280 miles to a tank sounds about right to me. I bet all Ford gauges are like this..

Click to expand...

my old '02 v6 mustang actually stayed on FULL for a long time and then started dropping down normally at the same rate.

but yeah, its not really a big problem, just a little annoying.