I don't have any long flat stretches of road around here to do a precise speed vs. mpg test for the Aerocivic, but on 200+ mile round trips (Clinton,SC to Bishopville, SC) on the interstate I'm averaging mid 70's mpg on 70 to 75mph trips and low 60's mpg on 80mph trips. Both trips were run at 500 to 150 feet elevation with temps mostly in the 60's F. At 2000 feet elevation with temps in the 80's F at 65mph I average mid 80's mpg on the 35 mile stretch of I-26/US25 between Asheville, NC and the NC/SC state line.
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