Fuel Economy Fraud

The report identifies six loopholes—three regulatory and three tax/policy-based—that have contributed to a decline in U.S. fleet fuel economy from a 1987 peak of nearly 26 mpg to 24.4 mpg by 2004. These include the misclassification of passenger vehicles as 'non-passenger' to meet lower standards, the total exemption of vehicles over 8,500 lbs GVWR, and inflated credits for dual-fuel vehicles that rarely use alternative fuels. It also highlights tax incentives for luxury SUVs and the exclusion of light trucks from the 'gas guzzler' tax. The authors argue that closing these loopholes could reduce U.S. oil dependence by 1.5 million barrels per day by 2025 and save consumers $33 billion.

• The 'non-passenger vehicle loophole' allows automakers to classify minivans, SUVs, and some cars as non-passenger vehicles to qualify for a fuel economy standard that is 25 percent lower than the passenger vehicle standard. This misclassification contributed to an extra 16 billion gallons of gasoline consumption in 2004.
• Vehicles with a gross vehicle weight rating (GVWR) between 8,500 and 10,000 pounds, known as Commercial Light Duty Trucks (CLDTs) or Class 2b trucks, are entirely exempt from fuel economy standards and labeling requirements. This loophole resulted in an estimated 900 million gallons of excess gasoline and diesel consumption in 2005.
• The dual-fuel loophole, established by the Alternative Motor Fuels Act, provides CAFE credits based on the assumption that flexible-fuel vehicles (FFVs) use alternative fuels 50% of the time, whereas government data shows they actually use alternative fuels less than 1% of the time. This has allowed manufacturers like DaimlerChrysler, Ford, and GM to avoid over $1.6 billion in CAFE fines.
• A luxury SUV tax loophole exists because vehicles with a GVWR over 6,000 pounds are exempt from depreciation limits that apply to cars and lighter trucks. This encourages small-business owners to purchase large luxury SUVs to maximize first-year tax deductions via Section 179 of the Internal Revenue Code.
• The 'gas guzzler' tax, which targets inefficient cars, does not apply to vehicles classified as light trucks. If a proposed tax schedule for non-passenger automobiles were applied to MY2003 sales, it would have generated approximately $880 million in revenue, with over 60% coming from large SUVs.
• The report warns that moving to attribute-based CAFE standards (based on weight or size) without a 'backstop' or ratchet mechanism would create new loopholes. In one scenario, a weight-based standard implemented in 2003 would have led to a 1.5 mpg decrease in overall fuel economy by 2015 due to 'upweighting' trends.
• Closing the identified loopholes could lead to significant environmental and economic benefits by 2025, including a reduction in oil dependence by 1.5 million barrels per day and a reduction in global warming pollution by 240 million metric tons of CO2-equivalent.

APA

MACKENZIE, D., BEDSWORTH, L., & FRIEDMAN, D. (2005). Fuel Economy Fraud. Union of Concerned Scientists. https://www.ucs.org/sites/default/files/2019-09/executive_summary_final.pdf

Chicago

MACKENZIE, DON, LOUISE BEDSWORTH, and DAVID FRIEDMAN. Fuel Economy Fraud. Union of Concerned Scientists, 2005. https://www.ucs.org/sites/default/files/2019-09/executive_summary_final.pdf.

Wikipedia

{{cite report |last1=MACKENZIE |first1=DON |last2=BEDSWORTH |first2=LOUISE |last3=FRIEDMAN |first3=DAVID |title=Fuel Economy Fraud |publisher=Union of Concerned Scientists |date=August 2005 |url=https://www.ucs.org/sites/default/files/2019-09/executive_summary_final.pdf |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{mackenzie2005fuel, author = {MACKENZIE, DON and BEDSWORTH, LOUISE and FRIEDMAN, DAVID}, title = {{Fuel Economy Fraud}}, institution = {Union of Concerned Scientists}, year = {2005}, month = aug, url = {https://www.ucs.org/sites/default/files/2019-09/executive_summary_final.pdf}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }