Chevrolet Colorado Diesel unexpectedly gets lower mpg rating

GM does not yet have an explanation for why the 2019 model year has a lower rating than the 2018 edition.

General Motors has unexpectedly dropped its fuel-efficiency ratings for the 2019 Chevrolet Colorado diesel, narrowing its mpg advantage over the gasoline edition.

The 2018 model year carries a rating of 22 mpg in the city, 30 on the highway and 25 mpg combined for the 2WD edition with a six-speed automatic transmission and 2.8-liter turbodiesel engine.

Revisions for the 2019 model year, spotted by The Truth About Cars, bring the city rating down to 20 mpg and drop the combined figure to 23 mpg for the same configuration. Interestingly, highway remains unchanged at 30 mpg.

TTAC was told that GM is looking into the issue, but the company has not provided an official explanation for the discrepancy.

Before the change, the Environmental Protection Agency's estimated annual fuel costs for the gasoline four-cylinder edition or the turbodiesel were matched at $1,950. After the apparent correction, the diesel powertrain's estimated cost has jumped to $2,100.

GM in 2016 halted sales for nearly 60,000 crossovers after admitting the window stickers showed fuel efficiency ratings 1-2 mpg higher than they should have been.

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