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Im sorry to break it to you, but a 3.8 firebird is going to get about 18 MPG in town, compared to a 5.7...which gets 17
Depends on how you drive it. I had to drive my old 98 V6 like I stole it to get it down to 18-19. I normally got low-mid 20s in town. I also got 32mpg highway out of it consistently. It was a freak mpg-wise.
My current one, yeah, it gets below that... modding seems to have that effect