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Discussion Starter · #5 ·
Growing emission regulations are the main reason for this and there are varying levels of success with them. The new 4 cylinder in the Silverado has been found to have worse mpg than the V8.
 

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Discussion Starter · #9 ·
Is anyone really buying an SUV for fuel economy? GM has done what they can with a high gear transmission and start/stop. There isn't a huge difference between the 2.5 and 3.6 either, but I'd wait to hear some real world numbers. These WLTP and EPA numbers as always exaggerated.
 
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