2015 Fuel Economy MPH Silverado 
Green Car Congress
JULY 14, 2014
View of the CNG tank in the bed of a Silverado 2500HD with bi-fuel option. liter Duramax B20-capable diesel engine with twice the torque of either the gasoline or the bi-fuel models. Silverado 2500HD engine options. Vortec 6.0L (bi-fuel). Refueling the Silverado at a 3,600 psi pump, indicated by the yellow handle.
Green Car Congress
AUGUST 21, 2014
2015 Hydra-Matic 8L90 (M5U) Eight Speed RWD Automatic Transaxle Click to enlarge. GM is offering a version of its new GM-developed Hydra-Matic 8L90 paddle-shift eight-speed automatic transmission in the 2015 Corvette Stingray ( earlier post ) and Z06. In the 2015 Corvette Stingray, the new 8-speed enables a class-leading 29-mpg (8.1
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