E85 in South Dakota runs about $2.89/gal, $0.10 below the national average of $2.99 (3% cheaper). Prices below come from the national alternative-fuels database plus crowd-verified driver reports, and each station page shows exactly when its price was last confirmed.
Every E85 station in South Dakota (page 2 of 2)
| Station | Address | E85 |
|---|---|---|
| Kwik Star | 500 W Willow St, Harrisburg | $3.05 |
| Casey's | 2300 Broadway Ave, Yankton | $3.14 |
| Sinclair | 3851 Elgin St, Rapid City | $3.18 |
| Casey's | 901 E 4th Ave, Milbank | $3.19 |
| Kwik Star | 4300 E 57th St, Sioux Falls | $3.19 |
| The Fox Stop | 1316 West 30th , Yankton | $3.29 |
| Casey's | 100 S Derby Ln, North Sioux City | $3.30 |
| Holiday | 4707 E US-12, Aberdeen | $3.38 |
| Cenex | 152 4th St NE, Watertown | $3.39 |
| Clark | 47155 250th St, Baltic | $3.44 |
| Circle K | 3245 S Sycamore Ave, Sioux Falls | $3.54 |
| Shell | 2160 Highland Way, Mitchell | $3.59 |
| Circle K #6532 | 3700 N Potsdam Ave, Sioux Falls | $3.69 |
| Cubby's | 1700 W Havens Ave, Mitchell | $4.89 |
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Top cities for E85 in South Dakota
Sioux Falls (26) · Watertown (9)
Is E85 worth it in South Dakota?
E85 is usually 15–30% cheaper per gallon than regular gas, but ethanol carries ~27% less energy, so the honest test is cost per mile — E85 wins when it's priced at least 20–25% below regular. E85 App compares that for you automatically. (More: is E85 actually cheaper?)
Know what's really in the pump
Pump "E85" isn't a fixed 85% ethanol — it's legally 51–83% and drops in winter, which changes your octane and how you blend to E30/E50. (More: your E85 isn't 85%.)
Find E85 now
Live prices, the real ethanol map, and a blend calculator — free on iPhone.
Download on theApp StoreOnly flex-fuel vehicles (FFVs) should run E85 — confirm compatibility before you fill. See how to find E85 near you or browse other states.