Silverado 2.7 4x4 info

Is that why GMC's Twin Six is still ruling the highways? 702 cubic inches, plenty of umph.
Few people even know what that is. Of course, the big GM V12 was incredibly thirsty, so the turbodiesel won out when it came to real world economical operation. I remember hearing that they were capable of 2mpg!

Fast forward to today, where the Cummins Turbo Diesel is 44% thermally efficient and will move a 26 foot moving van at slightly better than 10MPG.
 
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