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My van has a cd of 0,36 and nearly four square meters of frontal area. Best P&G speed seems to be about 70-80 km/h (50 mph) and the highest speed interval which still gives results (measured with Scangauge) is about 90-100 km/h (60 mph).
This is consistent with the rule of thumb that over 80 km/h, aero begins to dominate the sum of resistances.
Since your cd value is even worse, piwoslaw may be right in advising you to slow down to get better results.
so long,
tinduck
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