Quote:
Originally Posted by Ian33
Also, many cities and states mandate additives like ethanol at certain times of year. Tier 1 is only based on gas based on the standard. If ethanol is mandated, then that gas no longer meets the tier 1 standard even if it is sold by a tier 1 station.
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Here's the critreia for Tier 1 gas:
http://www.toptiergas.com/deposit_control.html
It's all about the additive package for deposit control and includes ethanol as a additive as well:
1.3.1.2 Base Fuel. The base fuel shall conform to ASTM D 4814 and shall contain commercial fuel grade ethanol conforming to ASTM D 4806. All gasoline blend stocks used to formulate the base fuel shall be representative of normal U.S. refinery operations and shall be derived from conversion units downstream of distillation. Butanes and pentanes are allowed for vapor pressure adjustment. The use of chemical streams is prohibited. The base fuel shall have the following specific properties after the addition of ethanol:
1. Contain enough denatured ethanol such that the actual ethanol content is no less than 8.0 and no more than 10.0 volume percent.
It also includes all grades of a retailer as well - not just premium.
Here in my part of New England the only Tier 1 gas available is Shell and I pay no more for their gas than at other retailers - $3.11 for regular on my last fill up.