Cheapest Gas in Thornton, CO
Updated April 5, 2026 — Prices updated regularly from EIA data
$2.87
Lowest price at Costco in Thornton
Finding Cheap Gas in Thornton
Hunting down the lowest gas price in Thornton, Colorado is worth the effort. At $$2.87 per gallon at the cheapest outlet versus $$3.12 at the most expensive, you save $$3.75 on every 15-gallon fill-up.
Maximum Savings in Thornton
Choose Costco over Chevron
$0.25 per gallon
$3.75 per 15-gallon fill • $12.00 per year (est.)
Cheapest Brands in Thornton
| Rank | Brand | Est. Price | Savings vs. Most Expensive |
|---|---|---|---|
| #1 | Costco | $2.87 | $0.25 |
| #2 | Speedway | $2.99 | $0.13 |
| #3 | Circle K | $3.00 | $0.12 |
| #4 | Sunoco | $3.03 | $0.09 |
| #5 | Marathon | $3.04 | $0.08 |
| #6 | BP | $3.06 | $0.06 |
| #7 | Mobil | $3.07 | $0.05 |
| #8 | Exxon | $3.08 | $0.04 |
| #9 | Shell | $3.10 | $0.02 |
| #10 | Chevron | $3.12 | $0.00 |
Gas Saving Tips for Thornton Drivers
- 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.
- Use a gas rewards credit card. The Costco Citi Visa earns 4% back on eligible gas; Blue Cash Preferred earns 3% at US gas stations. Pairing a reward card with a warehouse club maximizes savings.
- Avoid filling up at highway exits, airports, and tourist areas where convenience premiums routinely add 15-25 cents per gallon.
- Keep your tires properly inflated to the manufacturer's recommended PSI — under-inflated tires reduce fuel economy by up to 3%, costing you money every mile.
- Accelerate and brake gradually. Aggressive driving can reduce fuel economy by 15-40%, directly increasing how often you fill up.
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