Ethanol-Free Gas in Mason City, IA

4 verified ethanol-free gas stations

Mason City has 4 verified ethanol-free gas stations, all Casey's locations. All 4 carry 87-octane E0. For 90-octane or higher E0, the closest option is Maverik in Clear Lake, Iowa, about 7 miles away. Every listing is independently verified; the most recent check in Mason City was May 5, 2026.

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Ethanol-Free Gas in Mason City

Casey's

1361 12th St Nw, Mason City, IA

6412550163

oct

Casey's

1607 S Federal Ave, Mason City, IA

6412550176

oct

Casey's

2701 19th St Sw, Mason City, IA

6412550180

oct

Casey's

813 N Federal Ave, Mason City, IA

6412550165

oct

All Iowa Stations

Nearby Cities with Ethanol-Free Gas

Straight-line distance from Mason City.

Clear Lake, IA

3 stations · 8 mi away

Iowa Falls, IA

3 stations · 43 mi away

NEW HAMPTON, IA

3 stations · 46 mi away

WAVERLY, IA

3 stations · 48 mi away

Cedar Falls, IA

7 stations · 58 mi away

Ethanol-Free Gas in Mason City: FAQ

Is there ethanol-free gas in Mason City, IA?

Yes. Mason City has 4 gas stations verified to sell ethanol-free (E0) gasoline: Casey's (4 locations).

Does Mason City have 90-octane or higher ethanol-free gas?

Not currently. Stations in Mason City top out at 87-octane E0. The nearest station with 90-octane or higher is Maverik in Clear Lake, Iowa, about 7 miles away.

Which brands sell ethanol-free gas in Mason City?

Casey's (4 locations). All locations are independently verified through chain-website confirmation or direct source data; the most recent verification in Mason City was May 5, 2026.