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G Petroleum-Based Fuel Economics M ost of the energy currently used in fuel-powered transportation vehicles (for ex ample, cars, trucks, buses, and airplanes) is in the form of liquid fuels derived from petroleum.
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From page 315... ...
315 APPENDIX G per barrel over the same period and an even higher relative increase in natural gas price. At the same time it predicts only a 6-percent increase in the price of ethanol.
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