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6 Gasoline Brands That Are Wastes of Your Money
Inadequate gas quality can impact your car’s ability ... “Sam’s Club fuel lacks the higher-quality additives in Top Tier ...
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Don't Waste Your Money | The differences between midgrade and premium fuel
As for the growing price spread, AAA says Shell and Chevron premium are considered "top tier" gas, with special additives to reduce carbon buildup. Those additives are what makes it expensive.