I bought a Chevy truck new in 96 with a 4.3 & 5 speed. This truck would go 600 miles on a tank of gas.Thats about 19.4 MPG. My 06 with the 4.3 and automatic will only do 500 miles on a tank of gas. Thats about 16.2. So they are relatively thrifty. If I already didn't have the 283 installed I would go to the 4.3 in a minute.
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