Verdict out on Top Tier gas

Terry Jacksonq_v2.gifDear Terry,
Is Costco gas as good as Tier One gas?
-- Richard

a_v2.gifDear Richard,
As I have written before, a group of refiners and manufacturers have agreed on certain formulations for detergents and other additives in fuel and labeled the fuel as Top Tier gas.

According to the group's Web site, retailers and refiners who produce Top Tier gas include QuikTrip, Chevron, Texaco, MFA Oil, Conoco, Phillips 66, 76, Entec Stations, Shell, Somerset Refinery, Kwik Trip/Kwik Star, Aloha Petroleum, Tri-Par Oil., Turkey Hill Minit Markets, Mileage Stations, Chevron Canada, Shell Canada, Petro-Canada and Sunoco Canada.

If your local Costco buys its gas from one of these suppliers, then it's Top Tier. The bigger question is whether Top Tier really improves or protects your car's performance. The verdict is still out.

Here are this week's reader questions:
  • How would GM bankruptcy affect you?
  • Can I swap my car loan?
  • Is my wife responsible for her mother's payment?
  • Is Costco gas of Top Tier quality?



Show Bankrate's community sharing policy
          Connect with us

Get cost-cutting tips for buying, selling and maintaining your wheels. Delivered monthly.

Partner Center


Tara Baukus Mello

Driving high-mileage cars the new normal

The percentage of Americans driving cars with 100,000 miles or more has shot up in the past several years, says a survey by AutoMD.  ... Read more

Connect with us