THe only way to do gas mileage is to fill up all the way (the 87-93 stangs have a 15.4 gallon tank, yours should be the same), reset the trip, and drive. When you need gas, go fill up, look at how much it took (gal.) and then divide the number of miles on the trip by the gal. I usually get 200-220 on a tank if i drive nice, and thats 100% city sh1ty.
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