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Re: 4.3l vs. 5.7l in a commuter truck
I drive a ZZ4 in my truck. 13-15 MPG in the city. 18.5 on the highway. The ZZ4 is a performance motor. It's about torque. Above 1500 RPMs, it makes 300+ ft/lbs of torque.
4.3 use a 96 or later with an updated FI. My 4 door Jimmy weighs as much as our trucks. 16-17 city, 21-23 highway, 20 MPG at 80 MPH!!
On a 350, I would swap a cam on a 96 and later Vortec with a carb. Great power and great milage.
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