E85 in Watertown runs about $2.18/gal, $0.81 below the national average of $2.99 (27% cheaper).
Every E85 station in Watertown
| Station | Address | E85 |
|---|---|---|
| Stone's Truck Stop | 3801 9th Ave SE | $2.09 |
| Cowboy Country Store | 504 9th Ave SE | $2.18 |
| Cowboy Country Store | 1400 4th St NE | $2.18 |
| Prairie Stop | 1007 9th Ave SW | $2.18 |
| Sioux Valley Co-op - Cenex | 1016 5th St SE | $2.18 |
| Cenex - Sioux Valley Coop Highway 212 | 1601 9th Ave SE | $2.34 |
| Tip Top | 46399 US Highway 212 | $2.34 |
| Sioux Valley Co-op - Cenex | 220 10th St NW | $2.71 |
| Cenex | 152 4th St NE | $3.39 |
Find E85 near you in Watertown
Open the E85 App to see every Watertown station around you with live prices, the cheapest pump highlighted, and one-tap directions. (See how to find E85 near you.)
Is E85 worth it in Watertown?
E85 is usually 15–30% cheaper per gallon than regular, but ethanol has ~27% less energy — so judge it on cost per mile. E85 wins when priced ~20–25% under regular, and the app does that math for you. (More: is E85 cheaper?)
See all E85 stations in South Dakota.
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.