2015 MPH Silverado Standards 
Green Car Congress
JULY 14, 2014
View of the CNG tank in the bed of a Silverado 2500HD with bi-fuel option. In week of driving a 4x4 standard box crew cab version of the truck, the 6.0L Silverado 2500HD engine options. If you have a 3,600 psi rated tank—as does the Silverado—and you refuel at a 3,000 psi pump, you only get a partial fill.
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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