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Old 11-28-2007, 10:06 AM   #14 (permalink)
MetroMPG
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
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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: 73.57 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 55.99 mpg (US)
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I had near perfect weather conditions for doing a little experiment: light north winds, which are blocked by a ridge and tree line that runs along the north side of my usual "test" road, leaving the road in nearly still air.

I did an A-B-A, where A = both mirrors on, and B = passenger mirror off (with the hole covered) and driver's mirror folded, with my aero hinge insert in place (see pics, earlier in this thread).

Speed was 88 km/h / 54.7 mph, cruise control set once, cancelled with the brake and resumed for each pass. (Yes, an odd speed choice. I tried to set the cruise control right at 90k, but didn't quite make it. )

55.25 mpg (US) - average of first A runs (2 bi-directional runs)

56.51 mpg (US) - average of B runs (2 bi-directional runs)

55.04 mpg (US) - average of last A runs (1 bi-directional run)

For an average difference of 1.27 mpg between all A and B runs, or an increase in FE of 2.3% at this speed, for this car. Not quite the 2.94 mpg 5.19% improvement estimated earlier in this thread (for just one mirror removed!). But also not insignificant.

So there you go.
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