I usually run about 23.5 to 25.5 with a 60% highway and 40% city mix. My gas gauge doesn't work so I use the trip odometer all the time. I have had the low fuel warning light come on several times (a little orange fuel pump lights up on the light bar) and the car required around 14 gallons to fill at that point. So there is quite a bit of fuel in there when the warning comes on. At least in my 92 there is.

JP