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On the highway the weight doesn't matter as much as the aero and I'd think the 2013 Camaro is more aerodynamic then a 66 Chevelle. Even though the 2013 Camaro is rated at 30MPG on the new highway test, the actual raw, uncorrected, old standard, highway rating on it is 41.9 MPG. So driven with a mild foot and kept under 60 mph the v6 2013 Camaro can break 40mpg.
The 3.6 with the 6 speed auto weighs about 550 pounds and an all iron smallblock and powerglide weigh about 750
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