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Old 06-14-2018, 10:18 AM   #19 (permalink)
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,234

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

MPGiata - '90 Mazda Miata
90 day: 52.07 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)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)
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CR adds some data: Honda Accord, Toyota Camry

Updating this 11 year-old thread...

Consumer Reports asked:
What's the Impact of Carrying Stuff on the Roof?

They tested with a  2013 Honda  Accord at 65 mph / 105 km/h.

  • 42 mpg US - baseline with nothing on the roof
  • 37 mpg - empty bike rack
  • 35 mpg - empty bike rack with wind deflector (made it quieter, but increased drag)
  • 27 mpg - two bikes on the rack (didn't specify deflector or not)
They also tested a 2008 Camry with a large car-top carrier...
  • fuel economy dropped by 5 mpg

Moral of the story: carry stuff inside the car or on the back whenever possible!

Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: Oops, I did it again! Bought another cheap, 3-cylinder Mirage. Mods in progress...
Ecodriving test: Manual vs. automatic transmission MPG showdown

has launched a forum for the efficient new Mitsubishi Mirage - fuel efficiency info for Geo Metro owners - electric car conversion on a beer budget
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