What is Ethanol Fuel? Ethanol Blending & Delivery Guide
Ethanol is a renewable, grain-based alcohol blended into nearly all gasoline sold in the United States. From the standard E10 blend to E85 flex fuel, ethanol plays a major role in American fueling. Here is what you need to know about ethanol fuel, blending, and delivery.
What Is Ethanol Fuel?
Ethanol fuel is denatured ethyl alcohol (grain alcohol) produced primarily from corn in the United States, though sugarcane, cellulosic biomass, and other feedstocks are also used. Fuel-grade ethanol is 'denatured' — meaning a small amount of gasoline or other additives are mixed in to make it undrinkable and exempt from beverage alcohol taxes.
The United States is the world's largest ethanol producer, generating over 17 billion gallons annually. Approximately 98% of U.S. ethanol is produced from corn, with production concentrated in the Midwest (Iowa, Nebraska, Illinois, Indiana, Minnesota). The Renewable Fuel Standard (RFS) mandates blending ethanol into the nation's gasoline supply to reduce petroleum dependence and greenhouse gas emissions.
Ethanol has an octane rating of approximately 113 AKI, significantly higher than conventional gasoline. This high octane is one reason ethanol is blended into gasoline — it raises the overall octane of the finished fuel blend. A base gasoline with an 84 octane rating becomes 87 octane regular when blended with 10% ethanol. Ethanol's octane-boosting property also makes it valuable as a racing fuel additive.
Ethanol Blend Levels: E10, E15, E85
E10 (10% ethanol, 90% gasoline) is the de facto standard gasoline in the United States. Over 97% of gasoline sold nationwide contains up to 10% ethanol. E10 is approved for use in all gasoline-powered vehicles manufactured since the 1980s. When you fill up at virtually any Florida gas station, you are purchasing E10. This blend is so universal that it is simply labeled 'gasoline' or 'unleaded' at the pump.
E15 (15% ethanol, 85% gasoline) is approved by the EPA for use in model year 2001 and newer vehicles. E15 availability has expanded significantly since 2022, when year-round E15 sales were authorized in several states. E15 is not yet widely available in Florida but is gaining market share nationally. Vehicles older than model year 2001, motorcycles, boats, small engines (lawnmowers, chainsaws), and off-road equipment should NOT use E15.
E85 (51-85% ethanol) is the highest ethanol blend sold at retail and is only compatible with Flex Fuel Vehicles (FFVs). The ethanol content varies seasonally — higher in summer (up to 85%), lower in winter (as low as 51%) to ensure adequate cold-start performance. E85 offers the highest octane (~105 AKI) and the lowest per-gallon cost, but delivers 25-30% fewer miles per gallon due to ethanol's lower energy content.
How Ethanol Affects Engines
At the E10 level, ethanol's impact on engines is minimal and well-managed by all modern vehicle designs. Every gasoline engine sold in the U.S. for the past 30+ years is designed and warranted for E10 use. Fuel system materials, gaskets, seals, and fuel lines are all compatible with 10% ethanol content.
Higher ethanol concentrations (E15, E85) present compatibility concerns for vehicles not designed for them. Ethanol is a solvent that can degrade certain rubbers, plastics, and composites used in older fuel systems. It can also corrode aluminum and zinc components. This is why E85 requires specially designed Flex Fuel Vehicle fuel systems with corrosion-resistant materials throughout.
Ethanol is hygroscopic — it absorbs moisture from the air. In humid climates like Florida, this property is especially relevant. Ethanol-blended fuel stored in partially filled tanks can absorb enough moisture to cause 'phase separation,' where the ethanol and water separate from the gasoline and settle to the bottom of the tank. This water-ethanol layer can damage fuel systems, clog injectors, and prevent engines from starting. Proper storage practices — keeping tanks full, minimizing air exposure, and using fuel stabilizers — mitigate this risk.
Florida Ethanol Requirements
Florida follows federal Renewable Fuel Standard (RFS) requirements, which effectively mandate ethanol blending in gasoline. Virtually all gasoline sold at Florida retail stations is E10. The state does not have its own separate ethanol mandate beyond the federal RFS, but the economic incentives of using ethanol as an octane booster make E10 the universal standard.
Florida's warm, humid climate creates unique challenges for ethanol-blended fuels. The year-round high humidity increases the risk of moisture absorption and phase separation in storage tanks. Marine fuel consumers in Florida strongly prefer ethanol-free gasoline when available, as boats are particularly vulnerable to ethanol-related water absorption and corrosion in the saltwater environment.
Ethanol-free gasoline (sometimes called 'pure gas' or 'recreational fuel') is available at a limited number of Florida stations, primarily serving marine and small-engine customers. It carries a premium price — typically $0.30-$0.50 more per gallon than standard E10. BettyJet can source ethanol-free gasoline for customers with marine or specialty engine requirements.
Ethanol Storage Considerations
Ethanol-blended fuels require more careful storage management than non-ethanol fuels. The shelf life of E10 gasoline is approximately 3-6 months under optimal conditions — shorter than non-ethanol gasoline due to ethanol's tendency to absorb moisture and accelerate oxidation. In Florida's hot, humid conditions, shelf life may be shorter without fuel stabilizers.
Storage tanks for ethanol-blended fuel must be compatible with ethanol. Older fiberglass underground storage tanks (pre-1990s) may not be rated for ethanol blends and can experience swelling, cracking, or dissolution of the tank lining. Modern storage tanks are designed for ethanol compatibility, but operators with older infrastructure should verify tank ratings.
Best practices for ethanol fuel storage in Florida include: keeping tanks as full as practical to minimize condensation; installing desiccant breather filters on tank vents; conducting regular water checks and draining accumulated water; using fuel stabilizers for any fuel stored beyond 30 days; and rotating inventory on a first-in-first-out basis to ensure freshness.
Ethanol Blend Comparison: E10 vs E15 vs E85
| Property | E10 (Standard) | E15 | E85 (Flex Fuel) |
|---|---|---|---|
| Ethanol Content | Up to 10% | 10.5-15% | 51-85% |
| Vehicle Compatibility | All gasoline vehicles | 2001+ vehicles only | FFV only |
| Octane Boost | Moderate (+3 AKI) | Slightly more | High (~105 AKI) |
| MPG Impact | ~3% less than pure gas | ~4-5% less | 25-30% less |
| Price | Standard (most common) | Slightly less | $0.50-$1.00 less/gal |
| Florida Availability | Virtually all stations | Limited | ~60 stations |
| Marine/Small Engine Safe | Yes (post-1980s) | No | No |
| Shelf Life | 3-6 months | 3-6 months | Shorter (hygroscopic) |
Who Uses Ethanol Fuel?
Every Gasoline Consumer
E10 ethanol-blended gasoline is the de facto standard — over 97% of gasoline sold in the U.S. contains ethanol. Nearly every gasoline vehicle on the road uses ethanol-blended fuel.
Flex Fuel Vehicle Operators
Fleet operators and individuals running FFVs can use E85 for cost savings and sustainability benefits. Government fleets are often mandated to use E85 when available.
Fuel Blenders & Distributors
Refineries and fuel distributors purchase denatured fuel ethanol for blending into finished gasoline products at terminals and distribution points.
Agricultural Operations
Farm operations are major consumers of ethanol-blended gasoline for trucks, ATVs, and portable equipment. Many farmers also support ethanol as a market for their corn crop.
Learn more →How BettyJet Delivers Ethanol Fuel
BettyJet delivers ethanol-blended gasoline (E10) in all octane grades — 87, 89, and 91 — as well as E85 flex fuel to fleet yards, job sites, and commercial facilities across Florida. We also source ethanol-free gasoline for marine and specialty applications where available.
For fuel distributors and blenders, BettyJet can deliver denatured fuel ethanol in bulk for on-site blending operations. Our supply chain sources ethanol from major producers and delivers it via tanker truck to your terminal or blending facility.
All ethanol fuel deliveries meet applicable ASTM D4806 (denatured fuel ethanol) and ASTM D5798 (E85) specifications. Contact BettyJet at (813) 694-8898 or visit bettyjet.com/get-a-quote for ethanol fuel delivery pricing and scheduling.
Ethanol Fuel Frequently Asked Questions
What is ethanol fuel?
Ethanol fuel is denatured grain alcohol — typically produced from corn in the U.S. — that is blended with gasoline to create motor fuel. The most common blend is E10 (10% ethanol), which is the standard gasoline sold at virtually all U.S. gas stations. Higher blends include E15 and E85.
Does all gasoline in Florida contain ethanol?
Nearly all gasoline sold in Florida contains up to 10% ethanol (E10). Ethanol-free gasoline is available at a limited number of stations, primarily for marine and small-engine use, at a price premium of $0.30-$0.50 per gallon over standard E10.
Is ethanol bad for engines?
At the E10 level, no — all gasoline engines manufactured since the 1980s are designed for E10. Higher ethanol blends (E15, E85) can damage engines not designed for them. Ethanol absorbs water, which can cause phase separation in storage tanks — a particular concern in Florida's humid climate. Use fuel stabilizers and keep tanks full.
What is the difference between E10, E15, and E85?
E10 contains up to 10% ethanol and is compatible with all modern gasoline engines. E15 contains up to 15% ethanol and is approved only for 2001+ vehicles. E85 contains 51-85% ethanol and is only for Flex Fuel Vehicles (FFVs). Higher ethanol content means higher octane but lower fuel economy.
Does BettyJet deliver ethanol and ethanol-free fuel?
Yes. BettyJet delivers standard E10 gasoline in all octane grades, E85 flex fuel, and ethanol-free gasoline (where available) across Florida. We also deliver denatured fuel ethanol in bulk for blending operations. Call (813) 694-8898 for pricing.
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