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on the flip side it seems much easier to work on than the V6 style.The 4.3 is a V6 based on the small block Chevy V8. The 4.2 is a DOHC I6. The two engines have nothing in common, other than the fact that they both burn gasoline. The Trailblazer is just a large body-on-frame SUV with poor aerodynamics and an outdated transmission. You just cannot expect it to get stellar fuel mileage in stock trim.
The 4.3 is a V6 based on the small block Chevy V8. The 4.2 is a DOHC I6. The two engines have nothing in common, other than the fact that they both burn gasoline. The Trailblazer is just a large body-on-frame SUV with poor aerodynamics and an outdated transmission. You just cannot expect it to get stellar fuel mileage in stock trim.