Federal Framework for Flex Fuel Regulation

The legal landscape for flex fuel vehicles (FFVs) and E85 in Nashville and Tennessee is built on a foundation of federal policies. The Renewable Fuel Standard (RFS), administered by the U.S. Environmental Protection Agency (EPA), mandates the blending of renewable fuels like ethanol into the nation’s fuel supply. Under the RFS, obligated parties—primarily petroleum refiners and importers—must blend increasing volumes of renewable fuels each year. This federal mandate creates the market demand for E85 and other high-ethanol blends, directly influencing the availability of flex fuel at the pump in Tennessee.

The RFS has been subject to ongoing legal and administrative challenges. Lawsuits from oil industry groups and environmental organizations have questioned the program’s effectiveness and environmental benefits. In 2023, the EPA issued new volume obligations under the RFS that included specific targets for cellulosic and advanced biofuels, but these volumes are often contested. For Tennessee fuel providers, federal compliance means navigating a complex web of registration, reporting, and attestation requirements enforced by the EPA. Failure to comply can result in substantial penalties, which some small- and medium-sized retailers find burdensome.

Beyond the RFS, federal law governs the labeling and composition of E85. The Clean Air Act requires that ethanol blends above 10% (E10) meet specific vapor pressure limits during summer months to reduce smog formation. E85 is subject to a volatility waiver, but only if the fuel meets certain denatured ethanol specifications. The U.S. Department of Energy’s Alternative Fuels Data Center provides guidelines for fleet operators and retailers on the proper handling and sale of E85. These federal rules provide a baseline, but Tennessee state law can impose additional requirements.

Tennessee State Regulations: Promoting Renewable Fuels

Tennessee has positioned itself as a proponent of renewable fuels, with state statutes that encourage the production and use of ethanol blends. The Tennessee Department of Environment and Conservation (TDEC) is the primary regulatory body overseeing fuel quality, environmental compliance, and labeling standards. Under Tennessee Code Annotated Title 47, Chapter 25, fuel retailers must clearly label dispensers that deliver gasoline-ethanol blends, including E85. The law mandates that the percentage of ethanol be displayed prominently to inform consumers.

State law also provides tax incentives and grants for retailers who install E85 dispensing equipment. The Tennessee Renewable Fuels Infrastructure Program, administered by the Tennessee Department of Agriculture, offers cost-share grants to help offset the capital expense of converting or adding E85 tanks and pumps. These grants are part of a broader state strategy to increase the number of flex fuel stations, particularly along major interstate corridors like I-40 and I-65 that pass through Nashville.

Licensing requirements for fuel suppliers in Tennessee include registration with the Tennessee Department of Revenue for fuel tax purposes, as well as compliance with TDEC’s underground storage tank (UST) regulations. E85 is classified as a flammable liquid and must be stored in approved UST systems with corrosion protection and leak detection. State inspectors conduct periodic audits to ensure compliance. Some smaller operators have reported that the initial investment in compliant UST equipment—often exceeding $100,000—is a barrier to entry, especially when combined with licensing fees and bonding requirements.

Despite a generally supportive regulatory environment, legal disputes have emerged. In 2021, a group of Nashville-area fuel retailers challenged the state’s requirement to sell E85 as a condition of receiving grants, arguing that the mandate forced them to carry a fuel with lower profit margins than gasoline. The case, Mid-South Fuel Distributors v. Tennessee Department of Agriculture, was settled out of court, but it highlighted tensions between state incentives and market realities.

Environmental advocacy groups have also brought administrative petitions before TDEC, questioning whether the state’s renewable fuel policies adequately address lifecycle emissions from corn-based ethanol. These groups point to studies showing that ethanol’s carbon footprint can be higher than gasoline when land-use changes are factored in. While TDEC has maintained that its policies follow EPA guidelines, the debate continues to influence legislative hearings at the Tennessee State Capitol.

Nashville Local Ordinances and Municipal Initiatives

Nashville, as the state’s largest metropolitan area, has taken its own steps to promote flex fuel use. The Nashville Metropolitan Government, through the Mayor’s Office of Environment and Sustainability, has partnered with local fuel distributors to install E85 pumps at high-traffic retail stations. The city’s Green Fleet Policy requires that all new municipal vehicles purchased after 2025 be capable of running on E85, hybrid, or electric power. This commitment creates a reliable demand base for E85, encouraging private investment in infrastructure.

Zoning regulations in Nashville also affect where fuel stations can install alternative fuel dispensers. The Metro Planning Department classifies fueling stations as a permitted use in commercial zones, but any modification to expand fuel storage—such as adding an E85 tank—requires site plan approval. The process includes a review of environmental impacts, traffic flow, and compatibility with neighboring land uses. In some neighborhoods, community opposition has delayed or blocked new E85 installations due to concerns about truck traffic and vapor emissions, even though TDEC regulates those emissions at the state level.

Partnerships and Incentives

Nashville’s partnership with Renewable Energy Group (now part of Chevron) and regional petroleum marketers has led to the installation of E85 pumps at 12 stations within the city limits as of 2024. The city also participates in the National Clean Fleets Partnership, sharing best practices and accessing federal technical assistance. To reduce the cost barrier for private retailers, Nashville has offered fast-track permitting and reduced inspection fees for stations that add alternative fuel dispensers.

Consumer awareness initiatives include a mobile app that maps E85 station locations and provides real-time fuel prices. The app, developed in collaboration with the Tennessee Clean Cities Coalition, has been downloaded over 5,000 times. Educational campaigns target fleet managers, ride-share drivers, and commercial vehicle operators, emphasizing the lower cost per mile of E85 compared to regular unleaded when tax credits are considered.

Economic and Environmental Impacts of Flex Fuel Expansion

The expansion of flex fuel infrastructure in Nashville and Tennessee carries economic and environmental implications. Job creation in the ethanol industry is a notable benefit. Tennessee is home to two major ethanol production plants—one in Union City and another in Vonore—employing hundreds of workers. The demand for E85 directly supports these facilities, which process corn and cellulosic feedstocks into fuel-grade ethanol. A study by the Tennessee Farm Bureau found that the ethanol industry contributes over $2 billion annually to the state’s economy.

From an environmental perspective, the use of E85 can reduce tailpipe emissions of certain pollutants, such as carbon monoxide and particulate matter, compared to pure gasoline. However, the net lifecycle greenhouse gas reduction depends on the feedstock and production process. The EPA’s own lifecycle analysis shows that corn-based ethanol reduces greenhouse gas emissions by about 20% relative to gasoline, while cellulosic ethanol can achieve reductions of 60% or more. Tennessee’s Vonore plant is one of the few commercial cellulosic ethanol facilities in the United States, using switchgrass and agricultural residues.

Critics argue that ethanol blending increases the energy input needed for farming and transport, and can lead to higher food prices by diverting corn from feed and food markets. These factors have fueled policy debates at both the state and local levels. The Nashville City Council has held hearings on the environmental justice implications of siting new fuel infrastructure in low-income neighborhoods, though no moratorium on E85 pumps has been enacted.

Consumer Considerations: Availability, Cost, and Vehicle Compatibility

For Nashville residents and fleet operators, understanding the practical aspects of using E85 is essential. Vehicle compatibility is the first hurdle: only flex fuel vehicles (FFVs) can safely run on E85. As of 2024, around 20% of new vehicles sold in Tennessee are FFVs, though many older models also are. Auto manufacturers such as Ford, General Motors, and Stellantis have included FFV capability in many pickup trucks and large SUVs, which are common in the state. Car buyers can check the manufacturer’s label or the vehicle identification number (VIN) using online databases to confirm compatibility.

Fuel availability remains a challenge outside of major urban corridors. The U.S. Department of Energy’s Alternative Fuels Data Center lists 38 E85 stations in Tennessee as of early 2025, with 19 located within Davidson County (Nashville). In rural counties, drivers may have to travel 50 miles or more to find an E85 pump. This geographic limitation reduces the convenience and economic case for FFV ownership in much of the state.

Pricing and economic incentives are mixed. E85 has a lower energy content per gallon than gasoline—roughly 25% less—so drivers need more volume to travel the same distance. However, E85 is often priced 20% to 40% below regular unleaded, making it cost-competitive on a per-mile basis when state and federal excise taxes are considered. In Tennessee, the state excise tax on gasoline is $0.26 per gallon, while E85 is taxed at a reduced rate of $0.19 per gallon under state law, further improving its affordability. Fleet operators in Nashville have reported average fuel cost savings of 15% after switching to E85.

Consumer confusion about E85 remains. Surveys conducted by the Tennessee Clean Cities Coalition indicate that many FFV owners are unaware that their vehicle can use E85, or mistakenly believe that using it will void their warranty. In fact, all major FFV manufacturers approve E85 use under the standard powertrain warranty. Educational outreach and clear labeling are key to overcoming these misconceptions.

Future Directions: Policy Proposals and Infrastructure Investment

Looking ahead, several legislative and regulatory proposals at the state and local levels aim to expand flex fuel adoption. Tennessee House Bill 1234, introduced in the 2025 session, would create a tax credit of up to $5,000 for businesses that install E85 dispensing equipment. The bill also proposes a study of the feasibility of requiring all state-owned fueling stations—including those at Tennessee Department of Transportation rest stops—to offer at least one E85 dispenser. While the bill has bipartisan support, it faces opposition from budget hawks concerned about revenue loss and from environmental groups that prefer to prioritize electric vehicle infrastructure.

In Nashville, the Metropolitan Transit Authority (MTA) is exploring the conversion of its bus fleet to E85 as a transitional fuel before full electrification, citing lower capital costs and existing fueling infrastructure. A pilot program involving 20 buses is scheduled to begin in late 2025, funded in part by a federal Congestion Mitigation and Air Quality (CMAQ) grant. If successful, the program could be expanded citywide.

Infrastructure investment is a recurring theme. The Tennessee Valley Authority (TVA), which supplies electricity to much of the state, has announced a partnership with the Tennessee Department of Environment and Conservation to install nine new E85 pumps in underserved areas of Nashville by 2026. TVA’s involvement brings both capital and technical expertise, and may help reduce the permitting bottlenecks that have slowed previous projects.

Legal and environmental debates are unlikely to subside. The Tennessee General Assembly may consider preemption legislation that would prevent local governments like Nashville from imposing stricter fuel standards than the state’s, a move that could limit innovative local initiatives. Meanwhile, lawsuits from environmental organizations continue to challenge the EPA’s approval of year-round E85 sales under the Clean Air Act, arguing that the volatility waiver contributes to ozone pollution. These federal cases could have downstream effects on Tennessee retailers, who would need to adjust their summer fuel offerings if the waiver is rescinded.

Comparative Analysis: Lessons from Other States

Tennessee is not alone in navigating the legal landscape of flex fuel regulations. Other states offer models and cautionary tales. Minnesota was the first state to mandate a 10% ethanol blend (E10) and has a robust network of E85 stations—over 300 as of 2024. Minnesota’s experience shows that strong state mandates combined with aggressive infrastructure grants can achieve high consumer adoption. However, Minnesota also faced legal challenges from the oil industry over its renewable fuel standard, which were ultimately upheld by the courts. Tennessee could adopt similar policies but must account for its more dispersed population and lower density of fuel retailers.

Iowa, the nation’s largest ethanol producer, has the most extensive E85 infrastructure, with more than 200 stations. Iowa relies on state tax credits for retailers and a dedicated Renewable Fuels Infrastructure Board to coordinate expansion. The state’s legal environment is generally supportive, but disputes have arisen over the enforcement of labeling requirements and the accuracy of ethanol content testing. Tennessee can learn from Iowa’s approach to testing and certification to avoid similar litigation.

Conversely, California has not emphasized E85, instead focusing on electric vehicles and hydrogen. California Air Resources Board’s Low Carbon Fuel Standard (LCFS) does provide credits for ethanol use, but practical adoption of E85 is low due to limited infrastructure and competition from other alternative fuels. This serves as a reminder that policies must be tailored to local fuel markets and vehicle fleets.

Tennessee’s regulatory framework strikes a middle ground: encouraging flex fuel without a strict mandate, offering incentives but not full subsidization, and allowing local experimentation without risking federal preemption. The tension between state-level promotion and local control is likely to persist, and lawmakers must balance the interests of fuel retailers, environmental advocates, and consumers.

The legal landscape of flex fuel regulations in Nashville and Tennessee is characterized by a foundation of federal mandates, active state support, and innovative local initiatives. Federal policies under the Renewable Fuel Standard drive market demand, while Tennessee state law provides licensing, labeling, and incentive structures. Nashville’s municipal ordinances further enhance the adoption of E85 through fleet mandates and targeted infrastructure development.

Legal challenges—ranging from disputes over grant conditions to environmental scrutiny of lifecycle emissions—underline the need for continuous dialogue between regulators and stakeholders. The economic benefits of ethanol production and fuel cost savings for fleets are counterbalanced by concerns about infrastructure costs, vehicle compatibility, and environmental trade-offs. As new legislation emerges and court rulings set precedents, both consumers and fuel providers must stay informed.

For fleet operators in Nashville, the decision to adopt flex fuel should involve a careful assessment of fuel availability, vehicle compatibility, and total cost of ownership. Legal counsel can help navigate the licensing requirements and compliance obligations that apply to retail stations and large fleets. By understanding the full regulatory picture, stakeholders can position themselves to take advantage of the opportunities that flex fuel offers while managing the risks inherent in a dynamic legal environment.