Who would object?
Answer: Millions of owners of high-performance engines and older cars who fear corrosion and other nasty side effects. Ethanol attracts water. In turn, the resulting condensation can corrode the fuel lines, fixtures, and tank components (steel, rubber, aluminum, etc). We're talking rust, clogging, and deterioration. For modern cars, the oxygen atom in the ethanol molecule may confuse the exhaust sensor when measuring the fuel/air mixture going into the cylinders. The mixture may be too lean, producing a hot exhaust capable of damaging the catalytic converter. The end result may also be more nitrogen oxides, a building block for smog.
Many newer engines and parts have been designed to be more compatible with alcohol fuels, and E-15 will not be an issue. But E-10 has been a problem for some current and older models, and E-15 may be worse. Many in the auto industry have cautioned the EPA to do more science before it rules on the request.
Why does it matter? The fact is gasoline without ethanol may eventually become scarce or non-existent at the pump. We also face an education curve. For many people who already ignore the "contains up to 10 percent ethanol" they won't understand that 15 percent may cost them a pretty penny in repair bills.
A Quick Guide To Paint Regulations
There are two main issues with respect to regulatory oversight, volatile organic compounds (VOCs), and hazardous air pollutants (HAPs). VOCs include both man-made and naturally occurring chemical compounds that are released into the atmosphere as a gas. They are found in oil-based paints, adhesives, and cleaning supplies and may trigger respiratory irritation, headaches, or other health concerns. VOCs also react with nitrogen oxides and sunlight to form smog. Both federal and state regulators have imposed limits on VOC emissions, primarily at the manufacturer level. A number of products, from paint to engine degreasers and windshield washer fluids, have been reformulated to reduce their VOC levels. Additionally, there has been an effort to switch the public from oil-based paints and cleaning solvents (enamel, lacquer, mineral spirits, etc.) to water-based paints like latex. The paint industry has expanded the range of water-based finishes that are available to assist in the conversion. Sometimes it is not a voluntary switch. A number of states or urban areas have banned retail sales of certain oil-based products in an effort to combat smog.
HAPs pose a separate concern. They are hazardous metal compounds-cadmium, chromium, nickel, etc.-that become airborne during paint stripping operations or surface coating and autobody refinishing operations. The EPA now regulates most activities except low-volume operations, such as when hobbyists restore or customize one or two personal vehicles (or the equivalent in pieces) per year. The EPA rule establishes "best practices" (spray booth, spray gun cleaning, etc.) for minimizing HAP emissions during surface coating operations.
Regulating paint has been a balancing act: making sure hobbyists and commercial entities have access to affordable, quality paints while protecting health and environment. It has also been a moving target, since there is always the chance rules put in place today may not be deemed adequate upon further review. A good source for additional information is: http://www.ccar-greenlink.org/paintrule.html.