I'm pretty skeptical about claims to be "ethanol-free", too.
Quite a few national gasoline brands are members of the
Top Tier consortium of fuel standards:
76
Aloha Petroleum
Chevron
Chevron Canada
Conoco
CountryMark
Entec Stations
Esso
Exxon
Kwik Trip / Kwik Star
MFA Oil Co.
Mileage Stations
Mobil
Petro-Canada
Phillips 66
QuikTrip
Rebel Oil
Road Ranger
Severson Oil
Shell
Shell Canada
Sunoco Canada
Texaco
The Somerset Refinery, Inc.
Tri-Par Oil Co.
Turkey Hill Minit Markets
U.S. Oil
To be a member, a brand has to meet Top Tier fuel standards at EVERY SINGLE ONE of its retail stores. One of those
standards requires that the fuel must contain between 8 and 10 percent ethanol:
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.
2. Contain no less than 8 volume percent olefins. At least 75% of the olefins shall be derived from FCC gasoline as defined by CARB (advisory letter, April 19, 2001).
3. Contain no less than 28 volume percent aromatics as measured by ASTM D 1319 or D 5580.
4. Contain no less than 24 mg/kg sulfur as measured by ASTM D 2622 or D 5453. At least 60% of the sulfur shall be derived from FCC blend stock.
5. Produce a 90% evaporation distillation temperature no less than 290F. as measured by ASTM D 86.
6. Produce IVD no less than 500 mg averaged over all intake valves.
So, either those Shell, Chevron, Texaco, 76, Conoco, Mobil, Phillips 66 and Exxon stations that claim to be "ethanol-free" are lying, or they're violating the terms of their companies' Top Tier membership.