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Winter Storage Article

Environmentally Driven Gasoline Changes and Their Results

Required Change Environmental Reason Automotive Related Results
Reduction of Lead Use
1/1/85 1.1 gram avg. per gal.
7/1/85 0.5 gram avg. per gal.
1/1/86 0.1 gram avg per gal.
1/1/95 No lead or heavy metals
To reduce health hazards via reduction in airborne lead Fuel volatility is increased resulting in increas of hot-start/hot-driveability problems.
Regional Oxygenated-Fuel Program
To reduce CO emissions Increased use of ethanol and MTBE. No major automotive problems experienced.
EPA Phase I Volatility Controls
To reduce evaporative emissions and ozone formation Reduced vapor pressure of fuel results in dramatically reduced hot-start/hot-driveability problems.
EPA Phase II Volatility Controls
Further reduction in evaporative emissions and ozone formation Further reduction in vapor pressure should nearly eliminate all hot-start/hot-driveability problems. Some older vehicles may ezperience cold-start and warm-up performance problems on unseasonably cool days.
Oxygenated-Fuel Programs
1992 (All CO non-attainment areas)
To reduce CO emissions Expanded use of ethanol, MTBE, and possibly other oxygenates. No major problems anticipated based on success of existing programs.
Reformulated Gasoline
To reduce ozone formation and air toxins Further expanded use of fuel oxygenates. Some alteration of fuel properties. Performance standards expected to be similiar to existing gasoline.
Deposit-Control Additives
To reduce exhaust emissions Reduced CO and hydrocarbon emissions, improved warm-up performance due to lower intake-valve deposits.
Charts and tables for this article are taken from Changes in Gasoline II Technician's Manual, Downstream Alternatives Inc., 1995.