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depends what engine and rear axle combo you get. i had a low milegae 89' IROC 350 with the 2.77 axle. I got 17mpg in the city. then i had a low miles 90 IROC 350 with the 3.23 axle. i got 16 in the city. on the highway i'd usually get 23 doing 70-80mph. only time i got 25mpg was when i had to hold it at 55mph on a long trip cause i was driving behind my dad who was pulling a boat. that was the top of the line engine in those years and carried on through 1992.i don't think the lesser engines really got any better mileage actually.
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