Cheapest Gas in Casper, WY
Updated April 5, 2026 — Prices updated regularly from EIA data
$3.00
Lowest price at Costco in Casper
Finding Cheap Gas in Casper
Gas price hunting in Casper, Wyoming rewards the prepared driver. The spread between today's lowest ($$3.00) and highest ($$3.25) local prices is $$0.25 per gallon — a meaningful difference for anyone filling up weekly.
Maximum Savings in Casper
Choose Costco over Chevron
$0.25 per gallon
$3.75 per 15-gallon fill • $12.00 per year (est.)
Cheapest Brands in Casper
| Rank | Brand | Est. Price | Savings vs. Most Expensive |
|---|---|---|---|
| #1 | Costco | $3.00 | $0.25 |
| #2 | Speedway | $3.12 | $0.13 |
| #3 | Circle K | $3.13 | $0.12 |
| #4 | Sunoco | $3.16 | $0.09 |
| #5 | Marathon | $3.17 | $0.08 |
| #6 | BP | $3.19 | $0.06 |
| #7 | Mobil | $3.20 | $0.05 |
| #8 | Exxon | $3.21 | $0.04 |
| #9 | Shell | $3.23 | $0.02 |
| #10 | Chevron | $3.25 | $0.00 |
Gas Saving Tips for Casper Drivers
- Do not let your tank run below a quarter — low fuel levels increase wear on electric fuel pumps and can lead to emergency fill-ups at inconvenient and expensive stations.
- Check fuel prices across state lines if you regularly travel near a border. State fuel taxes vary by up to 50 cents per gallon — the savings from crossing into a lower-tax state can be dramatic.
- Use cruise control on highways to maintain steady speed. Speed variability increases fuel consumption; steady-state driving at 65 MPH uses significantly less fuel than oscillating between 55 and 75.
- Avoid idling for more than 60 seconds. Modern engines warm up faster while driving than idling, and idling gets literally zero miles per gallon.
- Park in shaded areas when possible — parking in the sun increases evaporative fuel loss from your tank and makes the engine work harder to cool the cabin when you start driving.
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