Well
Fireman, I don't have a 94GT but I have a 95GT and they pretty much identical
.
I'm not sure where you are, but if you are talking about $30 a tank I would guess that you are in Canada as that is what mine takes. Assuming the car is stock and in good running order you get actually get pretty good mileage around town and great mileage on the highway.
I kept good track of my mileage, only I go by how many km's I get per tank or litres. Most of the time with city driving I get around 400 km per 45 litres (tank, I always fill up at 1/4 full). On the highway I have gotten as high as 600 km per tank! (that's running closer to empty). My car needs a tune up right now and just before I was only getting 300-350km on a tank.
The thing that screws everthing up is when you start to step on the gas. As soon as you do that, these cars (stock or modified) drink fuel a plenty!
Hope that helps. Sorry if you think in miles, you'll have to convert all that (I'm too lazy. It's 5:40 pm on a Friday on a long weekend and I'm still in the office
)
------------------
Driving: 1998 F-150
Far way in Edmonton==>
1995 Mustang GT