How much miles on exactly 1/2 tank form full?

[maxg765]

Hello

I get the feeling I am not getting the correct miles from my SVX. I don't know what I get total on a full tank yet as I have not had it long. I do know that I have driven it to empty twice, never saw a low fuel indicator (does it have one?), and feel like I have filled it too many times. I recently filled it to the top with premium grade and reset the trip counter. I have reached exactly half a tank so far with a mix of city and highway and have only reached 88 miles at this half way mark.
The car
97 AWD with 47000 original miles
New winter tires
Still has original spark plugs from what I was told
All fluids are new
No issues seen, heard, or known
No snow yet
Regular driving style and no flooring.

I am sure that something is off. At this rate I will get just 170 miles on a full tank.l not to mention that the second half usually goes faster.

So, what should I get at the half way point and how much on a full tank with premium on a AWD model assuming everything is working as it should? How many gallons does the tank hold, it seems small as when I filled it it do not cost much.

If my car is poor on consumption what should I look at? I would assume the sparks but anything else?

Thanks in advance

Max