my 350 5 speed is runnin about mid teens if i stay out of the throttle... but thats not very often anymore... highway... i made it about a hundered miles or so on a little more than a quarter tank, but that was almost ALL highway.

 

MPG for a 3rd gen cars depends on a lot of things. such as the engine size & tanny ccombinations. But the most important factor in MPG is your own personal driving habits. Case in point, I have a 350 Crate engine that is not quite stock and can get 15 city/25 highway miles. But since you have the horses you don't keep them rained all the time, so I am happy with 13 mpg in the city even with hi-test at $3.00 +.

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My 92 RS 3.1L gets true 27 highway and anywhere from 18 to 21 city.