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Old 11-05-2013, 10:55 AM   #3 (permalink)
MetroMPG
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 21,470

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.8 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)
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Highest gear, lowest reasonable road speed.

People often mistake the "sweet spot" on the BSFC (Brake Specific Fuel Consumption) map as meaning that's where they should always try to operate the engine.

Not so. As RedDevil explains, that's where you want to operate the engine when moderate/heavy load is required (ie. when accelerating or climbing a steep grade).

But not when cruising at light load. Go for the highest gear/lowest RPM.
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