Small-Displacement Turbo Four Gets Marginally Better EPA Ratings than 4.3L V-6
The 2019 Chevrolet Silverado 1500 and GMC Sierra 1500 shocked the world when the companies behind the trucks announced that certain trims would come standard with a turbocharged I-4 in place of the outgoing 4.3L EcoTec3 V-6. But when it came time to test the trucks with the Environmental Protection Agency, the much-publicized 2.7L turbocharged I-4 in the GM trucks achieved only slightly better fuel economy than the old six-pot.
Its 20-mpg city rating is a fair improvement over the V-6, but the engine is let down by a 23-mpg highway rating and a 21-mpg combined rating, marginal improvements over the 4.3L V-6 and well down from V-6 competitors from Ford and Ram.
Well, GM says not to completely trust the EPA fuel economy numbers on the window sticker, as reported by Automotive News.
Tim Herrick, executive chief engineer for GM’s fullsize truck lineup, told a gathering of the automotive media in Arizona that the Silverado 1500 would be more fuel-efficient than its EPA ratings would suggest. That corroborates with what we heard when we drove the 2.7T prototype in May—back then, GM said the powertrain would be diesel-like in its real-world fuel economy, achieving better numbers on the road than in the lab.
“Don’t look at the label,” says Herrick. “We’re as good or better than [our competitors’ V-6 engines] in every step.”
Furthermore, as we said in our reporting of the truck’s fuel economy—linked above—the turbocharged I-4 has very impressive power and torque ratings for a base engine (it’s the standard option in the Silverado 1500 LT and RST and the Sierra 1500 SLE).
Source: Automotive News