Cheapest Gas in Idaho Falls, ID
Updated April 5, 2026 — Prices updated regularly from EIA data
$3.26
Lowest price at Costco in Idaho Falls
Finding Cheap Gas in Idaho Falls
Gas price hunting in Idaho Falls, Idaho rewards the prepared driver. The spread between today's lowest ($$3.26) and highest ($$3.51) local prices is $$0.25 per gallon — a meaningful difference for anyone filling up weekly.
Maximum Savings in Idaho Falls
Choose Costco over Chevron
$0.25 per gallon
$3.75 per 15-gallon fill • $12.00 per year (est.)
Cheapest Brands in Idaho Falls
| Rank | Brand | Est. Price | Savings vs. Most Expensive |
|---|---|---|---|
| #1 | Costco | $3.26 | $0.25 |
| #2 | Speedway | $3.38 | $0.13 |
| #3 | Circle K | $3.39 | $0.12 |
| #4 | Sunoco | $3.42 | $0.09 |
| #5 | Marathon | $3.43 | $0.08 |
| #6 | BP | $3.45 | $0.06 |
| #7 | Mobil | $3.46 | $0.05 |
| #8 | Exxon | $3.47 | $0.04 |
| #9 | Shell | $3.49 | $0.02 |
| #10 | Chevron | $3.51 | $0.00 |
Gas Saving Tips for Idaho Falls Drivers
- Check tire pressure monthly, especially as seasons change — tire pressure drops about 1 PSI for every 10-degree Fahrenheit temperature decrease.
- Fill up on Monday or Tuesday mornings — gas prices typically rise Thursday through Sunday as weekend demand increases, then reset lower early in the week.
- Use the GasBuddy or Waze app to compare prices within 5 miles of your location before every fill-up. Even a 10-cent difference on 15 gallons saves $1.50 each fill-up.
- Join a warehouse club (Costco, Sam's Club, BJ's) — their fuel consistently runs 10-25 cents below local market prices. The membership cost typically pays for itself in fuel savings within the first two months.
- Sign up for gas station loyalty apps — Shell Fuel Rewards, Marathon MakeItCount, and Circle K Inner Circle all offer genuine per-gallon discounts that compound over time.
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