Because at 15,000m/yr (typical U.S. motorist):
50 mpg = 300 gallons/yr,
and... lessee... what do we credit the Insight with? 65 mpg? (from fueleconomy.gov)
65 mpg = 231 gallons/yr.
and if the 50 mpg comes with the utility of 4+ passenger and stuff hauling capability... there ya go.
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