Tier 1 gas contains higher levels of detergent additives that help to remove and prevent carbon deposits in your engine, keeping your engine cleaner. It improves engine performance, helps maintain the engine over time, and has better fuel efficiency. Tier 1 gas is recommended by manufacturers, and it is beneficial for all vehicles regardless of their age or model.
To find a gas station with Top Tier or Tier 1 gas near year: see Top Tier. Pro-tip: Costco carries Top Tier gas.