Table: What the Choices Are

Shifting to hybrid cars--which use a combination of gas and electric engines --would boost fuel efficiency, but at a big price. Here are different options for improving the gasoline consumption of a midsize sedan, together with what each would cost.

FUEL COST FOR EFFICIENCY EACH GALLON OPTION (MPG) OF GAS SAVED*

TODAY'S MILEAGE STANDARDS 26.2 .-- MODERATE FUEL-EFFICIENCY STANDARDS 40.8 .57 cents AGGRESSIVE FUEL-EFFICIENCY STANDARDS 45.8 .60 cents PARTIAL HYBRID (15% OF POWER FROM ELECTRICITY) 52.6 $1.38 CONVERSION TO FULL HYBRID (40% OF POWER 59.3 $1.80 FROM ELECTRICITY)

* Based on 12 years, 12,000 miles per year, and a retail gas price of $1.35 per gallon Data: American Council for an Energy-Efficient Economy

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