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Hypermilers practice such unorthodox techniques as coasting for blocks with their car's engine turned off, driving far below speed limits on the freeway, pumping up tire pressure far beyond car and tire makers' recommendations and carefully manipulating the gas pedal to avoid fuel-burning excess.
They endure not only occasional honks from other motorists angry at their slow-poke ways, but intentional discomforts, as well. Like keeping the air conditioning off and windows barely cracked on a more than 90-degree day. Or parking in the boondocks at shopping centers so they can motor head-first toward the exit rather than backing out of a space.