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As we move closer to our vision of an all-electric portfolio, we also are improving the efficiency of ICE vehicles.

Continual improvements in vehicle engine and transmission efficiency, as well as vehicle weight, have helped us to eliminate excess materials use in manufacturing, while reducing fuel use and costs for customers. For example, the 4WD Crew Cab Silverado has seen an improvement in tailpipe CO2 emissions of 25% from 2000 through 2020.1

Within GM, we have institutionalized extensive governance processes that predict, plan, measure and assess our fleet’s fuel efficiency and emissions performance according to established government test procedures on a dynamic and country-by-country basis.

Well-to-Wheel CO2 Emissions per Light-Duty Vehicle2, 3

    2018 2019 2020
  USA 287 293 280
  China 220 208 206
  Brazil 200 198 195
  Weighted Average 245 243 240
Learn more about fuel efficiency and emissions regulation in the Public Policy section of this report.

U.S. Light-Duty Fuel Economy Technologies Across the Fleet
Percent of Total U.S. Light-Duty Volume


(reduces fuel usage when the vehicle is stopped)

74% MY21


aerodynamic drag)

83% MY21

Engine/Transmission Thermal Management

(warms up engine and transmission faster to reduce friction and losses)

56% MY21

High-Efficiency Alternators (72%+)

(reduce losses from electricity generation)

88% MY21
  1. Data prior to July 2009 corresponds to General Motors Corporation.
  2. 2021 data will be available mid-2022.
  3. Data has been restated to align with SBTi for Scope 3, Use of Sold Products. The SBTi standards require well-to-wheel (from fuel production to vehicle driving) for vehicle CO2 intensity (gCO2e/km) calculations. We have revised our numbers for 2018 through 2020 for this requirement. Going forward, GM will use the SBTi standards in calculating vehicle CO2 intensity. Numbers are inclusive of EV portfolio.