GAS80 compares Costco regular-gas prices along the San Francisco–Reno I‑80 corridor. It highlights the best California stop first, balancing price with a practical detour of roughly 10 miles or less, then shows the best Nevada price separately so lower Nevada fuel taxes do not automatically determine the recommendation. The three leading California contenders are rechecked about every 3 hours; the full corridor is refreshed about every 6 hours. Prices may change at the pump, so each result also shows when it was last updated.