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Originally Posted by Steve - SanJose
In short a V8 has the potential for slightly better highway mileage, that would be great. No way it's going to have better city or combined mileage though.
S.
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This data is directly from the Chevy website for Silverado 1500 trucks. The 4.3 L V6 (195 HP, 260 lb-ft) 4x4 with a 4-speed auto gets 15/18 MPG city/highway.
The 5.3 L V8 (295 HP, 335 lb-ft) 4x4 with a 4-speed auto gets 15/19 MPG city/highway.
This is just one example of no loss in city MPG but better highway MPG.