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I've got an LS3 so slightly better MPG most of the time.
It's up to 18MPG these days after adding a Vararam from 16 without it. There was also a negligible increase after I put on my axle back exhaust but that may just be from them being lighter. On the highway is a bit better at nearly 21 MPG.
Of course, the second you get into the pedal a little you can start counting down 1,000 - 1 gallon, 1,000 - 2 gallons.
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