Ethanol, Ethanol-Free Gas, and Why It Matters - A Plain-English Guide
Last verified: September 2026
Most pump gasoline is blended with ethanol, and that affects how well it stores and how it treats small engines. This guide explains the difference in plain English. Rather have a hand? My number is (330) 200-8042.
Ethanol and Ethanol-Free Gas, at a Glance
Not all gasoline behaves the same once it sits in a can or a tank. This guide covers what ethanol does to stored fuel and small engines, and when ethanol-free gasoline is worth seeking out in plain English. There's a printable 29-page version up top.
Common Questions
1 What is ethanol doing in my gasoline?
Most pump gasoline is blended with ethanol, a common fuel additive. It's usually noted right on the pump. For fuel you'll burn soon, the blend rarely matters much; for fuel headed into storage, it matters more.
2 Why is ethanol-blend fuel harder to store?
Ethanol tends to attract moisture from the air over time, which can cause it to separate from the gasoline and break down faster — not ideal for a can or tank that's going to sit for weeks or months.
3 What is ethanol-free gasoline, and where do I find it?
Gasoline blended without ethanol, sometimes sold at marinas, small-engine dealers, or select stations. It generally holds up longer in storage and is gentler on small engines over time.
4 Do I still need stabilizer if I use ethanol-free gas?
Yes. Ethanol-free fuel still ages, just typically more gracefully. Pair it with stabilizer and a rotation habit for the best results.
5 How do I know what fuel my generator or mower actually needs?
Check the engine's own owner's manual. It will say what fuel, and what ethanol content if any, the manufacturer considers safe — and that always outranks a general rule of thumb.
6 Can I use a higher-ethanol blend in my small engine?
Check the manual first. Many small engines aren't built for higher-ethanol blends, and using one against the manufacturer's guidance can cause problems over time.
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