Search Climate Insights Directory

A drivetrain delivers power from a vehicle's engine or motor to its wheels, influencing fuel consumption, mechanical efficiency, and cost. Hybrid vehicles employ three primary drivetrain types: series, where only the electric motor powers the wheels; parallel, where the engine and motor work in tandem; and series/parallel, which combines both methods to optimize efficiency across different speeds. While series/parallel systems offer the best fuel performance, they are more expensive due to the need for larger batteries, generators, and advanced computing.

The document examines the distinct advantages of battery electric vehicles (BEVs) and hydrogen fuel cell electric vehicles (HFCEVs), asserting that both are essential to meet climate goals. BEVs are highlighted for their efficiency and use of existing home electricity infrastructure, while HFCEVs are presented as superior for larger vehicles, longer ranges, and drivers without home charging access. The text emphasizes that these technologies are complementary rather than competitive, as they address different consumer needs while both eliminating tailpipe pollution.

The document highlights the economic and environmental advantages of electric vehicles (EVs) over gasoline-powered cars, noting that fuel savings can offset higher purchase prices and that EVs produce fewer global warming emissions regardless of the electricity grid's composition. It positions EVs as a central pillar of the 'Half the Oil' plan to reduce U.S. oil dependency through efficiency, biofuels, and advanced vehicle technology.

The 'HALF THE OIL' plan outlines a pathway for the United States to halve its projected oil use by 2035. The strategy relies on two main pillars: efficiency (improving passenger and commercial vehicles, and retrofitting buildings) and innovation (scaling electric vehicles, cellulosic biofuels, and smart transportation systems). The plan argues that these steps will save billions of dollars, reduce pollution, and establish U.S. leadership in transportation technology.

The 'Half the Oil' plan proposes reducing U.S. oil use by 50% over 20 years, projecting annual oil spending cuts of $550 billion, the creation of over 1 million jobs, and the elimination of 2 billion metric tons of global warming emissions per year by 2035. The strategy focuses on improving fuel efficiency for passenger vehicles and heavy-duty trucks, expanding the adoption of electric vehicles (EVs), and implementing 'smart growth' urban planning to reduce vehicle miles traveled.

The Union of Concerned Scientists (UCS) argues that the U.S. can cut its projected oil use in half by 2035 compared to a 'do-nothing' baseline. By implementing technology and policy advances across transportation, buildings, and industry, the plan estimates a reduction of 11 million barrels per day (mbpd), resulting in gross cost savings of more than $550 billion and the creation of over 1 million net new jobs by 2035.

The 'Half the Oil' plan proposes reducing U.S. oil use by over 11 million barrels per day by 2035. This is to be achieved through efficiency gains in vehicles and buildings (saving nearly 8 million barrels per day) and innovations such as electric vehicles and biofuels (saving over 4 million barrels per day).

The document analyzes how money spent on gasoline is distributed among stakeholders, finding that the majority goes to oil companies rather than local stations or the consumers themselves. It argues that drivers can save thousands of dollars over a vehicle's lifetime by choosing fuel-efficient or hybrid vehicles instead of continuing to fund oil company profits.

The document advocates for the Obama administration's proposed 2017-2025 vehicle standards to increase average fuel efficiency to approximately 50 mpg, arguing that fuel savings will outweigh the higher purchase price of cleaner vehicles. It dismisses expanded domestic drilling as an ineffective solution for reducing gas prices.

The U.S. EPA and DOT finalized national greenhouse gas and fuel economy standards for model year 2012-2016 vehicles, aiming to increase combined average fuel economy to 34.1 mpg and reduce tailpipe emissions to 250 grams per mile. These standards, resulting from a compromise between the White House, automakers, and fourteen states, are projected to save consumers billions of dollars, reduce oil consumption by 1.2 million barrels per day, and cut global warming emissions by 209 million metric tons by 2020.

The report argues that independent owner-operators in the U.S. are trapped in a cycle of using inefficient used Class-8 trucks due to subprime credit status and high upfront costs for new vehicles. It proposes the Federal Freight Efficiency Authority (FFEA), modeled after the Federal Housing Administration (FHA), to insure lease payments for new, efficient trucks. This mechanism would lower interest rates for truckers, increase their profit margins, and incentivize OEMs to produce more efficient vehicles. The author estimates that expanding this to small fleets could reduce Class-8 fuel consumption by 32%, saving 55 billion gallons of oil over ten years. The FFEA would be self-funded through insurance premiums and could potentially supplement the Highway Trust Fund with its profits.

The document outlines strategies to maximize vehicle fuel economy, categorizing them into vehicle maintenance, driving behavior, and systemic transportation changes. It highlights that proper maintenance, such as using low rolling resistance tires and reducing vehicle weight, can improve mileage. Driving habits, specifically reducing highway speeds and avoiding idling, are identified as key ways to cut fuel use. Finally, it advocates for a transition toward fuel-efficient vehicles, mass transit, and policies that reduce dependence on oil.

Friends of the Earth argues that the U.S. transportation system requires systemic reform to address its contribution to 30 percent of greenhouse gas emissions and nearly 70 percent of oil consumption. The organization emphasizes that the next Secretary of Transportation must update obsolete federal policies and financing mechanisms to support the Obama administration's targets of an 80 percent reduction in greenhouse gases by 2050 and a significant reduction in oil dependence within 10 years.

EESI and the National Plug-In Partners Campaign critique the DOE's draft PHEV R&D Plan for being insufficiently aggressive in its deployment timelines and for omitting smart grid capabilities. They argue that existing industry progress from companies like General Motors and Tesla proves that PHEVs can be brought to market faster than the DOE's projections. The authors recommend that the DOE accelerate its battery development phases and require all demonstration vehicles to be "smart grid-capable" to enable future vehicle-to-grid (V2G) functionality.

The report finds that the USS Princeton's cruise-condition electric load of 2 MW could be reduced by 20–50%, potentially lowering total fuel use by 10–25%. The most significant savings are identified in motors, pumps, fans, chillers, and lighting. A critical finding is that current operational practices—specifically running two gas turbine generators (GTGs) in parallel at partial loads—negate approximately 75–80% of the fuel savings that would otherwise result from electrical load reductions. The report recommends transitioning to single GTG operation during routine cruise conditions, implementing Variable-Speed Drives (VSDs), and adopting premium-efficiency equipment. More intensive strategies, including the use of fuel-cell generators and low-speed electric propulsion, could potentially reduce total fuel use by roughly 75%.

The document examines systemic fuel waste within the U.S. Department of Defense (DOD), highlighting how a lack of activity-based costing leads to the procurement of inefficient weapons platforms. It details how the actual cost of fuel is often understated because the logistics of delivery—such as midair refueling for B-52s or helicopter transport for tanks—are treated as free. The author presents evidence from a Defense Science Board Task Force and a specific study of the USS Princeton to demonstrate that retrofitting existing equipment and redesigning platforms for efficiency could save billions of dollars annually and enhance operational agility.

The document argues that CO2-EOR delivers net emission reductions on a life cycle basis, estimating that every barrel of EOR-produced oil emits 37% less CO2 than conventional oil and every tonne of CO2 utilized in EOR nets a 0.63 tonne emission reduction.

The document describes the global plastic pollution crisis as a systemic failure driven by increasing production and inadequate waste management. It highlights the environmental and health impacts across land and sea, specifically noting that plastics are projected to account for nearly 20% of total oil consumption and over 10% of the global 1.5°C carbon budget by 2050. The author advocates for a legally binding international framework focusing on reducing production and consumption, eliminating toxic additives, rejecting 'false solutions' like waste-to-energy incineration, and investing in zero waste city models.

The Union of Concerned Scientists reports that SUVs and light trucks in the United States have lower fuel economy and higher fatality rates than cars, contributing to higher consumer costs and increased global warming emissions. To address this, the organization designed the 'UCS Guardian' and 'UCS Guardian XSE' prototypes, which utilize existing technologies—such as unibody frames, improved aerodynamics, and electronic stability control—to increase fuel economy and safety. The report suggests that implementing these technologies across the light truck fleet could significantly reduce U.S. oil consumption and save thousands of lives annually.

The report concludes that the United States cannot meet its oil and GHG targets through vehicle technology alone and must also reduce per capita vehicle miles traveled (VMT). It highlights a lack of evaluation for existing federal transportation programs and recommends that the U.S. Department of Transportation and Congress prioritize funding and planning for strategies that reduce VMT, such as public transit and pricing, to eliminate oil imports by 2030.