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I'm not surprised you saw such a big difference with having the hatch open at low speeds.
Based on miscellaneous comments I read all over the web, people often seem to think that aero losses "magically" come into play only above some arbitrary speed.
Even at just 20 mph, 1/3 of the total power (about 1.2 hp) required to move a Metro goes to overcoming aero losses. 1/5 of the power at 15 mph. (Based a RR & aero loss spreadsheet, with all the usual formulas).
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